It is narrated from Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him), he says: I was sitting in a gathering of the Ansar when Sayyiduna Abu Musa Ash'ari (may Allah be pleased with him) came to us, and he seemed somewhat frightened. In fact, Sayyiduna Umar (may Allah be pleased with him) had summoned him. So I went to him and sought permission three times, but when I was not granted permission, I turned back, because the Messenger of Allah (peace and blessings be upon him) said: Whoever seeks permission three times from someone and is not granted permission, then he should return. When I informed Sayyiduna Umar (may Allah be pleased with him) of this hadith, he said: Bring proof of this, otherwise I will punish you. So I came to seek testimony. Sayyiduna Ubayy bin Ka'b (may Allah be pleased with him) said: The youngest among us should stand with you for this. Sayyiduna Abu Sa'id (may Allah be pleased with him) said: I was the youngest, so I stood up and testified that the Messenger of Allah (peace and blessings be upon him) said: Whoever seeks permission three times and is not granted permission, then he should return.

Ubaid bin Umair narrates that Sayyiduna Abu Musa Ash'ari (may Allah be pleased with him) went to the house of Sayyiduna Umar (may Allah be pleased with him) and sought permission to enter three times, but when permission was not granted, he turned back. Sayyiduna Umar said: Was I not just hearing the voice of Abu Musa Abdullah bin Qais? The household said: Yes, it was him. He said: Call him. So he was called. Sayyiduna Umar (may Allah be pleased with him) asked him: What made you do what you did? He said: I sought permission to enter three times, and when I was not granted permission, I turned back. This is the command we have been given. Sayyiduna Umar said: Bring proof for this, otherwise I will punish you. Sayyiduna Abu Musa went to the mosque or to the gathering of the Ansar and asked for a witness. They said: Our youngest servant will bear witness for you. So Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) stood up and bore witness for him. Sayyiduna Umar (may Allah be pleased with him) said: This Sunnah of the Messenger of Allah (peace and blessings be upon him) had remained hidden from me; the trade in the markets has made us heedless.

Sayyiduna Anas (may Allah be pleased with him) narrates that the Noble Prophet (peace and blessings be upon him) sought permission to visit Sayyiduna Sa’d bin ‘Ubadah (may Allah be pleased with him) and said:“Peace be upon you and the mercy of Allah.”In response, he said,“And peace be upon you and the mercy of Allah,”but did not let the Prophet (peace and blessings be upon him) hear it. The Prophet (peace and blessings be upon him) greeted three times, and Sayyiduna Sa’d (may Allah be pleased with him) also replied three times, but did not let the Prophet (peace and blessings be upon him) hear it. Eventually, the Prophet (peace and blessings be upon him) turned back, and Sayyiduna Sa’d (may Allah be pleased with him) followed behind and said:“O Messenger of Allah! May my parents be sacrificed for you, whenever you greeted, I replied, but did not let you hear it. In fact, I wanted to gain as much of your greeting and blessing as possible.”Then he took the Prophet (peace and blessings be upon him) into the house and presented dried dates before him. The Prophet (peace and blessings be upon him) ate, and when he finished, he made this supplication:“May the righteous eat your food, may the angels send blessings upon you, and may those who are fasting break their fast with you.”

. Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) narrates that the Noble Prophet (peace and blessings be upon him) said: When any of you enters someone’s orchard and wishes to eat from there, he should call out: O owner of the orchard! He should call out three times. If the owner responds, then that is fine; otherwise, he may eat from the orchard. And when any of you passes by camels and wishes to drink the milk of the she-camels, he should call out: O owner of the camels! Or: O herder of the camels! If he responds, then that is correct; otherwise, he may milk and drink. Hospitality is for three days; anything beyond that is charity upon the guest.

It is narrated from Sayyiduna Anas that when the Messenger of Allah, peace and blessings be upon him, spoke, he would repeat his words three times, and similarly, when he greeted people with salam, he would say salam to them three times.