It is narrated from Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) that Sayyiduna Abu Musa Ash'ari (may Allah be pleased with him) sought permission to enter upon Sayyiduna Umar (may Allah be pleased with him), but he was not granted permission, so he returned. Sayyiduna Umar (may Allah be pleased with him) asked: Why did you go back? He replied: I heard the Messenger of Allah (peace and blessings be upon him) say: "The one seeking permission should ask for permission three times; if he is granted permission, he may enter, otherwise he should return." Sayyiduna Umar (may Allah be pleased with him) said: You must bring a witness for this, otherwise I will deal very harshly with you. Sayyiduna Abu Sa'id (may Allah be pleased with him) said: Sayyiduna Abu Musa (may Allah be pleased with him) came to us while I was also present in the mosque with a group of the companions of the Messenger of Allah (peace and blessings be upon him). Sayyiduna Abu Musa (may Allah be pleased with him) was very anxious due to the warning of Sayyiduna Umar (may Allah be pleased with him). He stood among us and said: I ask you by Allah, if anyone has heard this from the Messenger of Allah (peace and blessings be upon him), let him bear witness with me. Sayyiduna Abu Sa'id (may Allah be pleased with him) said: I raised my head and said: Inform Sayyiduna Umar (may Allah be pleased with him) that I have also heard this along with you, and other companions also supported him. Upon hearing this, Sayyiduna Abu Musa (may Allah be pleased with him) became happy.