Sayyiduna Jabir bin Samurah (may Allah be pleased with him) narrates: When we used to perform prayer behind the Prophet Muhammad (peace be upon him), we would gesture with our hands (while saying) "As-salamu Alaikum" to the right and to the left. The Prophet Muhammad (peace be upon him) said: What is the matter, I see your hands moving like the tails of unruly horses? It is sufficient for each of you to place both his hands on his knees and then turn to the right and to the left to offer salam.