Ibrahim (may Allah have mercy on him) said that justice among Muslims is that there should be no criticism of him, neither openly nor secretly.

Hazrat Aamir (may Allah have mercy on him) says that as long as a person has not been subjected to a legal punishment or no defect is known in his religion, it is correct to accept his testimony.

Hasan (may Allah have mercy on him) considered the testimony of a person who performs prayers to be valid, unless his opponent brings forth such a reason by which his integrity can be questioned in court.

Hazrat Umar (may Allah be pleased with him) inquired about another person. He said, "I have only seen good in him." Hazrat Umar (may Allah be pleased with him) said, "This affirmation is sufficient for you."

Hazrat Shurayh (may Allah have mercy on him) says: First make a claim, then increase it, and seek much increase in it, and then establish just witnesses upon it. Surely, we have been commanded to judge with justice. And ask them, if they say: "Allah knows best," then Allah is the All-Knowing. And if they, being separate, say that he is doubtful (in doubt), then the testimony of one who is doubtful is not valid. And if they say: "We do not know about him except that he is just and a Muslim," then, insha’Allah, he is as such, and his testimony is valid.