Evidence from Qur'an and Sunnah
 

Linking blood relationships:

Allah says:

]وَالَّذِينَ يَصِلُونَ مَا أَمَرَ اللّهُ بِهِ أَن يُوصَلَ وَيَخْشَوْنَ رَبَّهُمْ وَيَخَافُونَ سُوءَ الحِسَابِ[ (الرعد: 21)

This means: “Those who join that which Allah has commanded to be joined (i.e. they are good to their relatives and do not sever the bond of kinship), fear their Lord, and dread the terrible reckoning (i.e. abstain from all kinds of sins and evil deeds which Allah has forbidden and perform all kinds of good deeds which Allah has ordained).” (13, Ar-Ra`d: 21)

Allah says:

]فَهَلْ عَسَيْتُمْ إِن تَوَلَّيْتُمْ أَن تُفْسِدُوا فِي الأرْضِ وَتُقَطِّعُوا أَرْحَامَكُمْ[
(محمد: 22)

This means: “Would you then, if you were given the authority, do mischief in the land, and sever your ties of kinship?” (47, Muhammad: 22)

  Allah says:

]فَآتِ ذَا الْقُرْبَى حَقَّهُ وَالْمِسْكِينَ وَابْنَ السَّبِيل[
(الروم: 38)

This means: “So give to the kindred his due, and to Al­Miskin (the poor) and to the wayfarer.” (30, Ar-Rum: 38)

Allah says:

]وَأُوْلُواْ الأَرْحَامِ بَعْضُهُمْ أَوْلَى بِبَعْضٍ فِي كِتَابِ اللّهِ[
(الأنفال: 75)

This means: “But kindred by blood are nearer to one another regarding inheritance in the decree ordained by Allah.” (8, Al-Anfal: 75)

Allah says:

]وَاتَّقُواْ اللّهَ الَّذِي تَسَاءلُونَ بِهِ وَالأَرْحَامَ[
(النساء: 1)

This means: “And fear Allah through Whom you demand your mutual (rights), and (do not cut the relations of) the wombs (kinship).”
(4, An-Nisa’: 1)

The Prophet (peace be upon him) said:

“And the one who believes in Allah and the Last Day should tie his kinship.” (Reported by Al-Bukhari)

The Messenger of Allah (peace be upon him) said:

“That who recompenses the good done to him by some one (relative) is not the one who upholds the ties of relationship. It is he who keeps good relations with those relatives who cut asunder the bond of kinship with him.” (Reported by Al-Bukhari)

The Messenger of Allah (peace be upon him) said:

“That who likes to be granted more provision, and his life be prolonged, let him tie his kith and kin.” (Reported by Al-Bukhari and Muslim)

The Prophet (peace be upon him) said:

“Charity towards a poor one is counted as charity, and towards a relation is both charity and keeping blood relationships.”
(Reported by At-Tirmidhi)

Abu Hurayrah (may Allah be pleased with him ) narrated that a man said to the Messenger of Allah (peace be upon him):

“I have relatives with whom I try to maintain ties of relationship, but they sever their relations with me; whom I treat kindly but they treat me badly, with whom I am gentle but who are rough to me.” He replied, “If you are as you say, it is as if you are applying hot ashes to them (they will bear the results of such bad conduct) and you will not be without a supporter against them from Allah as long as you do so.” (Reported by Muslim)

The Messenger of Allah (peace be upon him) said:

“Ar-Rahim (the ties of relationship) is suspending from the Throne (of Allah) saying: That who keeps good relations with me, Allah will keep good ties with him, but that who ever severs relations with me, Allah will sever the ties with him.” (Reported by Muslim)

The Messenger of Allah (peace be upon him) said:

“Allah created the creations and when He accomplished His creations, Ar-Rahim (the kinship) said: (O Allah) at this place I seek refuge with You from all those who sever me (sever the ties of kith and kin). Allah said: Yes. Are not you satisfied that I should keep ties with him who keeps you united and sever connection with him who severs you?”
(Reported by Al-Bukhari and Muslim)

The Prophet (peace be upon him) said:

“Allah, the Exalted, has said: I am Ar-Rahman (the Most Compassionate). I created Ar-Rahim (the uterus). I have derived its name from My name. If anyone joins it, I shall join him, and if anyone cuts it off, I shall cut him off.” (Reported by At-Tirmidhi)

Caring for the poor:

Allah says:

]وَأَنفِقُوا مِمَّا جَعَلَكُم مُّسْتَخْلَفِينَ فِيه[
(الحديد: 7)

This means: “And spend of that whereof He has made you trustees.”
(57, Al-Hadid: 7)

Allah says:

]وَالَّذِينَ فِي أَمْوَالِهِمْ حَقٌّ مَّعْلُومٌ. لِّلسَّائِلِ وَالْمَحْرُومِ[
(المعارج: 24 - 25)

This means: “And those in whose wealth there is a known right, For the beggar who asks, and for the unlucky who has lost his property and wealth, (and his means of living has been straitened).”
(70, Al-Ma`arij: 24 - 25)

Allah says:

]وَمَا أَنفَقْتُم مِّن شَيْءٍ فَهُوَ يُخْلِفُهُ وَهُوَ خَيْرُ الرَّازِقِينَ[
(سبأ: 39)

This means: “And whatsoever you spend of anything (in Allah's Cause), He will replace it. And He is the Best of providers.” (34, Saba’: 39)

Allah says:

]إِنَّمَا نُطْعِمُكُمْ لِوَجْهِ اللَّهِ لا نُرِيدُ مِنكُمْ جَزَاء وَلا شُكُورًا. إِنَّا نَخَافُ مِن رَّبِّنَا يَوْمًا عَبُوسًا قَمْطَرِيرًا. فَوَقَاهُمُ اللَّهُ شَرَّ ذَلِكَ الْيَوْمِ وَلَقَّاهُمْ نَضْرَةً وَسُرُورًا[ (الإنسان: 9 - 11)

This means: “We feed you seeking Allah's Countenance only. We wish for no reward, nor thanks from you. Verily, We fear from our Lord a Day, hard and distressful, that will make the faces look horrible (from extreme dislikeness to it). So Allah saved them from the evil of that Day, and gave them Nadratan (a light of beauty) and joy.” (76, Al-Insan: 9 - 11)

The Prophet Muhammad (peace be upon him) said:

“O son of Adam! You say: My property, my property. Have you anything but what you eat and use up or wear and make threadbare or give in charity and execute it?” (Reported by Muslim)

The Messenger of Allah (peace be upon him) said:

“O people, exchange greetings of peace (i.e., say: As-Salamu `Alaykum to one another), feed people, strengthen the ties of kinship, and be in prayer when others are asleep, (in return) you will enter Paradise in peace.” (Reported by At-Tirmidhi)

Anas Ibn Malik (may Allah be pleased with him) narrated:

“Whenever a person begged anything from the Messenger of Allah (peace be upon him) in Islam, he (the Prophet) would fulfill his demand. (Once) a man came to him (begging) and the Prophet gave him a herd of sheep scattered between the two mountains. When he returned to his people, he said to them: O my people! Enter the fold of Islam because Muhammad (peace be upon him) gives so much just as a person who has no fear of poverty and need.” (Reported by Muslim)

Guardianship of orphans:

Allah says:

]فَأَمَّا الْيَتِيمَ فَلا تَقْهَر[
(الضحى: 9)

This means: “Therefore, treat not the orphan with oppression.”
(93, Ad-Duha: 9)

Allah says:

]أَرَأَيْتَ الَّذِي يُكَذِّبُ بِالدِّينِ. فَذَلِكَ الَّذِي يَدُعُّ الْيَتِيمَ[
(الماعون: 1 - 2)

This means: “Have you seen him who denies the Recompense? That is he who repulses the orphan (harshly).” (107, Al-Ma`un: 1 - 2)

Allah says:

]وَآتُواْ الْيَتَامَى أَمْوَالَهُمْ وَلاَ تَتَبَدَّلُواْ الْخَبِيثَ بِالطَّيِّبِ وَلاَ تَأْكُلُواْ أَمْوَالَهُمْ إِلَى أَمْوَالِكُمْ إِنَّه كَانَ حُوبًا كَبِيرًا[
(النساء: 2)

This means: “And give unto orphans their property and do not exchange (your) bad things for (their) good ones; and devour not their substance (by adding it) to your substance. Surely, this is a great sin.” (4, An-Nisa’: 2)

Allah says:

]إِنَّ الَّذِينَ يَأْكُلُونَ أَمْوَالَ الْيَتَامَى ظُلْمًا إِنَّمَا يَأْكُلُونَ فِي بُطُونِهِمْ نَارًا وَسَيَصْلَوْنَ سَعِيرًا[
(النساء: 10)

This means: “Verily, those who unjustly eat up the property of orphans, they eat up only a fire into their bellies, and they will be burnt in the blazing Fire!” (4, An-Nisa’: 10)

Sahl Ibn Sa`d (may Allah be pleased with him) narrated that the Messenger of Allah (peace be upon him) said:

“That who takes care of an orphan and I will be in Paradise like these two (fingers). He raised his forefinger and middle finger by way of illustration.” (Reported by Al-Bukhari)

The Prophet (peace be upon him) said:

“Whoever passes his hand over the head of an orphan (out of kindness) only for the sake of Allah will have a virtue recorded to his credit for every single hair his hand passes over.”
(Reported by Ahmad)

The Messenger (peace be upon him) said:

“The best house (in a Muslim community) is that in which there is an orphan who is well-treated, and the worst (of their houses) is the one in which there is an orphan who is maltreated.”
(Reported by Ibn Majah)

The Messenger of Allah (peace be upon him) said:

“Avoid the seven deadly things. It was said: What are they, Messenger of Allah? He replied: Associating anything with Allah, practicing sorcery, killing one whom Allah has declared inviolable without a just cause, devouring the property of an orphan, devouring usury, fleeing from the battlefield, and accusing the pious women with adultery.”
(Reported by Al-Bukhari)