Musannaf Ibn Abi Shaybah

Hazrat Ibrahim bin Suwaid says that Hazrat Alqamah would turn his head to the right and say: "As-salamu ‘alaykum wa rahmatullah," and then turn his head to the left and say: "As-salamu ‘alaykum wa rahmatullah." And Hazrat Aswad, when he turned his head to the right, would say: "As-salamu ‘alaykum wa rahmatullahi wa barakatuhu," and when he turned his head to the left, he would say: "As-salamu ‘alaykum wa rahmatullahi wa barakatuhu."