It is narrated from Sayyiduna Zaid bin Khalid Juhani, may Allah be pleased with him, that the Messenger of Allah, peace and blessings be upon him, said: "Shall I not inform you of the best witness, who gives testimony before he is asked?"

It is narrated from Rabi’ah bin Abi Abdur Rahman that a man from Iraq came to Sayyiduna Umar, may Allah be pleased with him, and said: I have come to you regarding a matter that has neither head nor tail. Sayyiduna Umar, may Allah be pleased with him, said: What is it? He said: False testimonies have become widespread in our land. Sayyiduna Umar, may Allah be pleased with him, said: Really? He said: Yes. Then Sayyiduna Umar, may Allah be pleased with him, said: Now no Muslim shall be imprisoned without reliable witnesses.

Sayyiduna Umar (may Allah be pleased with him) said: The testimony of an enemy and an accused person is not valid.