It is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Beware of suspicion, for suspicion is the most false of speech. Do not spy on one another, nor compete with one another in the world. Do not turn your backs on one another, nor envy one another, nor bear malice, and become, O servants of Allah, brothers to one another."

It is narrated from Sayyiduna Anas bin Malik, may Allah be pleased with him, who said: The Prophet, peace and blessings be upon him, was with one of his pure wives when a man passed by. The Prophet, peace and blessings be upon him, called him and said: "O so-and-so! This is my such-and-such wife." He said: "With whomever I may have suspicion, I could never have suspicion about you." The Prophet, peace and blessings be upon him, said: "Indeed, Satan circulates in the son of Adam like blood circulates."

It is narrated from Sayyiduna Abdullah bin Uthman (may Allah be pleased with him) that the one who has been robbed continues to be suspicious, to the extent that he surpasses even the thief (in sin).

It is narrated from Bilal bin Sa’d Al-Ash’ari (may Allah have mercy on him) that Sayyiduna Muawiyah (may Allah be pleased with him) wrote to Sayyiduna Abu Darda (may Allah be pleased with him) asking him to send the names of the wicked (evil) people of Damascus. He replied: What concern do I have with the wicked people of Damascus? How would I recognize them? His son Bilal (may Allah have mercy on him) said: I will write their names. So he wrote their names. Sayyiduna Abu Darda (may Allah be pleased with him) asked: How did you come to know about them? How did you know that they are wicked, unless you are one of them? Therefore, write your own name first. And so, he did not send the names.