Allah says:

]إِنَّ اللّهَ يَأْمُرُكُمْ أَن تُؤدُّواْ الأَمَانَاتِ إِلَى أَهْلِهَا[
(النساء: 58)

This means: “Verily! Allah commands that you should render back the trusts to those, to whom they are due.” (4, An-Nisa’: 58)

Allah says:

]يَا أَيُّهَا الَّذِينَ آمَنُواْ لاَ تَخُونُواْ اللّهَ وَالرَّسُولَ وَتَخُونُواْ أَمَانَاتِكُمْ وَأَنتُمْ تَعْلَمُون[ (الأنفال: 27)

This means: “O you who believe! Betray not Allah and His Messenger, nor betray knowingly your Amanat (things entrusted to you, and all the duties which Allah has ordained for you).” (8, Al-Anfal: 27)

Allah says:

]إِنَّا عَرَضْنَا الأَمَانَةَ عَلَى السَّمَاوَاتِ وَالأَرْضِ وَالْجِبَالِ فَأَبَيْنَ أَن يَحْمِلْنَهَا وَأَشْفَقْنَ مِنْهَا وَحَمَلَهَا الإِنسَانُ إِنَّهُ كَانَ ظَلُومًا جَهُولا[
(الأحزاب: 72)

This means: “Truly, We did offer Al­Amanah (the trust or moral responsibility or honesty and all the duties which Allah has ordained) to the heavens and the earth, and the mountains, but they declined to bear it and were afraid of it (i.e. afraid of Allah's Torment). But man bore it. Verily, he was unjust (to himself) and ignorant (of its results).” (33, Al-Ahzab: 72)

Allah says:

]إِنَّ اللّهَ لاَ يُحِبُّ الخَائِنِين[
(الأنفال: 58)

This means: “Certainly Allah likes not the treacherous.” (8, Al-Anfal: 58)

Allah says:

]وَلاَ تَكْتُمُواْ الشَّهَادَةَ وَمَن يَكْتُمْهَا فَإِنَّهُ آثِمٌ قَلْبُهُ وَاللّهُ بِمَا تَعْمَلُونَ عَلِيمٌ[
(البقرة: 283)

This means: “And conceal not the evidence (testimony) for he, who hides it, surely his heart is sinful. And Allah is All-Knower of what you do.” (2, Al-Baqarah: 283)

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

“All of you are guardians and are responsible for your wards. The ruler is a guardian of his subjects and the man is a guardian of his family; the lady is a guardian and is responsible for her husband's house and his offspring; and so all of you are guardians and are responsible for you wards.” (Reported by Al-Bukhari and Muslim)

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

“Pay the deposit to him who deposited it with you, and do not betray him who betrayed you.” (Reported by Ad-Darqatni)

The honesty of the prophets:

Nuh:

Allah says:

]إِذْ قَالَ لَهُمْ أَخُوهُمْ نُوحٌ أَلا تَتَّقُونَ. إِنِّي لَكُمْ رَسُولٌ أَمِينٌ[
(الشعراء: 106 - 107)

This means: “When their brother Nuh (Noah) said to them: "Will you not fear Allah and obey Him? I am a trustworthy Messenger to you.”
 (26, Ash-Shu`ara’: 106 - 107)

Hud:

Allah says:

]إِذْ قَالَ لَهُمْ أَخُوهُمْ هُودٌ أَلا تَتَّقُونَ. إِنِّي لَكُمْ رَسُولٌ أَمِينٌ[
(الشعراء: 124 - 125)

This means: “When their brother Hud said to them: Will you not fear Allah and obey Him? Verily! I am a trustworthy Messenger to you.”
(26, Ash-Shu`ara’: 124 - 125)

 Allah says:

]وَلا تُصَعِّرْ خَدَّكَ لِلنَّاسِ وَلا تَمْشِ فِي الأَرْض مَرَحًا إِنَّ اللَّهَ لا يُحِبُّ كُلَّ مُخْتَالٍ فَخُورٍ. وَاقْصِدْ فِي مَشْيِكَ وَاغْضُضْ مِن صَوْتِكَ إِنَّ أَنكَرَ الأَصْوَاتِ لَصَوْتُ الْحَمِير[ (لقمان: 18 - 19)

This means: “And turn not your face away from men with pride, nor walk in insolence through the earth. Verily, Allah likes not each arrogant boaster. And be moderate (or show no insolence) in your walking, and lower your voice. Verily, the harshest of all voices is the voice (braying) of the ass.” (31, Luqman: 18 - 19)

Allah says:

]وَاخْفِضْ جَنَاحَكَ لِلْمُؤْمِنِينَ[
(الحجر: 88)

This means: “And lower your wings for the believers.” (15, Al-Hijr: 88)

Allah says:

]تِلْكَ الدَّارُ الآخِرَةُ نَجْعَلُهَا لِلَّذِينَ لا يُرِيدُونَ عُلُوًّا فِي الأرْضِ وَلا فَسَادًا وَالْعَاقِبَةُ لِلْمُتَّقِين[ (القصص: 83)

This means: “That home of the Hereafter (i.e. Paradise), We shall assign to those who rebel not against the truth with pride and oppression in the land nor do mischief by committing crimes. And the good end is for the Muttaqun (pious).” (28, Al-Qasas: 83)

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

“Wealth does not decrease by giving charity. Allah augments the honor of that who forgives, and that who behaves modestly Allah will exalt him in ranks.” (Reported by Muslim)

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

“It is Allah's Law that He lowers whatever raises itself in the world.” (Reported by Al-Bukhari)

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

“The most abhorrent and farthest to me among you will be the talkative, the Mutashaddiqun (those who utter words in a way that shows that they are eloquent) and the arrogant.”
(Reported by At-Tirmidhi)

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

“Verily, Allah has revealed to me that you should be humble. No one should transgress against one another, and no one should hold himself in high esteem.” (Reported by Muslim)

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

“Now, shall I inform you about the inmates of Hell? Every ignoble, impertinent, and proud man.” (Reported by Al-Bukhari and Muslim)

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

“There are three types of persons to whom Allah will not speak in the Day of Resurrection nor will He purify them or look at them and they will have a painful punishment. They are: an aged man who commits fornication, a ruler who is a great liar, and an arrogant poor person.” (Reported by Muslim)

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

“Allah, the Exalted, says: Honor is My lower garment and Pride is My cloak. Whoever vies with Me in one of them, I shall torment him.” (Reported by Muslim)

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

“A well-dressed man was walking proudly. He had combed his hair and he was walking majestically when Allah caused him to be swallowed up by the earth. Now he will continue to toss about in it till the Day of Resurrection.” (Reported by Al-Bukhari and Muslim)