Musannaf Ibn Abi Shaybah 27332 — Asking permission

Sayyiduna Abu Ayyub al-Ansari (may Allah be pleased with him) said: We said: O Messenger of Allah (peace and blessings be upon him)! This is the salam, so how is permission to be sought? He (peace and blessings be upon him) said: "A person says Subhan Allah, Allahu Akbar and Alhamdulillah, clears his throat and alerts the people of the house."