A:
It was
authentically reported that the Prophet (peace be upon him) used to perform Taslim in Prayer to the right and to the left while saying "As-salamu `alaykum warahmatullah (may Allah's Peace and Mercy be upon you)". It was authentically reported from
`Abdullah ibn Mas`ud (may Allah be pleased with him) that
"The Prophet (peace be upon him) used to pronounce Taslim (by turning his head) to his right side, saying 'As-salamu `alaykum warahmatullah' and to his left saying 'As-salamu `alaykum warahmatullah.'"
In another narration:
"I saw the Messenger of Allah (peace be upon him) pronouncing Taslim to his left and right sides until the whiteness of his cheek was seen."
May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.