Sayyiduna Ammar bin Yasir (may Allah be pleased with him) narrates: When the Prophet Muhammad (peace and blessings be upon him) turned his head to the right to say salam, the whiteness of his right cheek would become visible, and when he turned his head to the left to say salam, the whiteness of his left cheek would become visible. He (peace and blessings be upon him) would say salam with these words: "As-salamu ‘alaykum wa rahmatullah, as-salamu ‘alaykum wa rahmatullah."