It is narrated from Yahya ibn Sa'id that a man greeted Sayyiduna Abdullah ibn Umar (may Allah be pleased with them both), saying: "As-salamu 'alaykum wa rahmatullahi wa barakatuhu wal-ghadiyati war-ra'ihat" (Peace be upon you and the mercy of Allah and His blessings and the blessings of the morning and the evening, those that come and those that go). Sayyiduna Abdullah ibn Umar (may Allah be pleased with them both) replied: "Wa 'alayka alfa(n)" (And upon you a thousand times that), and he said it in such a way as if he disliked it.

It reached Imam Malik, may Allah have mercy on him, that when a person enters a house which is empty, he should say: "Peace be upon us and upon the righteous servants of Allah," that is: Peace be upon us and upon the righteous servants of Allah.