Allah, the Exalted, says:
"Verily! Allah commands that you should render back the trusts to those to whom they are due.'' (Quran-4:58)
Messenger of Allah Muhammad (Peace be upon him) said:
"There are three signs of a hypocrite:
- When he speaks, he lies;
- When he makes a promise, he breaks it
- When he is trusted, he betrays his trust."
[Hadith-Al-Bukhari and Muslim].