Musannaf Ibn Abi Shaybah 27339 — A man returning another's greeting

Sayyiduna Abu Hurayrah (may Allah be pleased with him) said: A man entered the mosque while the Messenger of Allah (peace and blessings be upon him) was sitting in a corner of the mosque. The man prayed, then gave the salam to him (peace and blessings be upon him), and he (peace and blessings be upon him) said: "Wa alayka as-salam, and peace be upon you as well."