Musannaf Ibn Abi Shaybah 27498 — A man who asks permission without

Ibn Buraydah said that a man asked permission from one of the Companions of the Prophet (peace and blessings be upon him) while he was standing at the door. The man said three times: "May I enter?" The Companion was looking at him but did not give him permission. Then he asked him: "As-salamu alaykum (Peace be upon you), may I enter?" He said to him: "Enter." Then he said: "Even if you had stood all night saying 'May I enter?' I would not have given you permission until you began with salam."