It is narrated from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) would turn to the right and to the left saying: "Peace be upon you and the mercy of Allah, peace be upon you and the mercy of Allah," (he, peace and blessings be upon him, would turn his face so much that) the whiteness of his cheeks would become visible.