It is narrated from Sayyiduna Zayd bin Khalid al-Juhani (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Shall I not tell you who is the best of witnesses? The one who presents his testimony before he is asked, and gives his testimony before he is questioned."

And with the same chain of narration, it is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that Sayyiduna Sa'd bin 'Ubadah (may Allah be pleased with him) said to the Messenger of Allah (peace and blessings be upon him): "What do you think, if I see a man with my wife, should I give him respite until I bring four witnesses?" The Messenger of Allah (peace and blessings be upon him) said: "Yes!"