(Imām Bukhārī narrates): Abū al-Walīd narrated to us, he said: Shu'bah narrated to us, from Abī Ya'fūr, he said: I heard Mus'ab ibn Sa'd, he narrates that:

I prayed beside my father; I joined my two palms together and placed them between my thighs, so my father forbade me and told me that we used to do this before, then we were forbidden from it, and we were commanded that we should place our hands upon our knees.