And Ahmad ibn Hanbal narrated to me, from Yahya ibn Sa'id, from Shu'bah, from al-Hakam, from Mujahid, from Abu Ma'mar, from 'Abdullah — Shu'bah said: he raised it (to the Prophet) once — that a commander or a man gave two salutations (of peace), so 'Abdullah said: "Whence did he acquire this?"