Musannaf Ibn Abi Shaybah 3085 — Those who used to give two salams

Abd al-A'la said: Abu Abd al-Rahman, while giving the salam to the right, said: 'As-salamu alaykum wa rahmatullah' (Peace be upon you and the mercy of Allah), and while giving the salam to the left, said: 'As-salamu alaykum wa rahmatullah'.