Q. Is shaking hands with one or two hands sunnah?
(Question published as received)
A. It is Sunnah to greet with two hands (Musaafahah).
Abdullah ibn Masud Radhiyallahu Anhu relates: “Allah’s Messenger Sallallahu Alayhi wa Sallam taught me the tashahhud as he taught me a surah (chapter) of the Qur’an while my hand was between both his hands.”
And Allah Knows Best