Silsilah as-Sahihah 767 — Position of arms during prostration

It is narrated from Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him), he says: It is as if I am (still) seeing the whiteness of the side of the Messenger of Allah (peace and blessings of Allah be upon him), in the state that he (peace be upon him) was prostrating.