One day, the Prophet (sallallahu `alayhi wa sallam) said to ‘Abdullah ibn ‘Amr, “How will you be if you are among a (lowly) group of people whose promises and trusts have become muddled up, and they differed so they became like this?” And he interlinked his fingers. He (‘Abdullah) said, “Allah and His Messenger know best.” The Prophet (sallallahu `alayhi wa sallam) said, “Act upon what you know and leave whatever you don’t know. Beware of discolouring (or colouring over) the religion of Allah. Upon you is to adhere to yourself (i.e. your matters) and leave the matters of the people.” [Abu Dawud, Ahmad, Ibn Majah; declared sahih by al-Hakim]

Ibn Mas’ud (ra) said, “The first thing which you will lose from the matters of your religion is amanah (trust), and the last thing to remain will be the prayer. Indeed, there will be people praying who have no religion.”

Anas (ra) said, “Seldom did the Messenger of Allah (sallallahu `alayhi wa sallam) give us a sermon except that he said, “There’s no faith (iman) for the one who has no trust (amanah), and there’s no religion (deen) for the one who breaks their oath/promise (‘ahd).” [Ahmad, al-Bayhaqi; hadith Hasan]

‘Umar ibn al-Khattab (ra) used to says, “Do not be fooled by the eloquence of a man at night (i.e. in prayer). Indeed a true man is one who fulfils the trust when he is entrusted, and from whose tongue and hands the Muslims are safe.”