Hazrat Muawiyah bin Qurrah narrates that my father advised me that when you meet someone, do not say "Assalamu Alaik" to him; rather, say "Assalamu Alaikum."

Hazrat Maymun bin Mehran narrates that a man greeted Hazrat Abu Bakr in this way: "O successor of the Messenger of Allah (peace and blessings be upon him)! Peace be upon you." Upon this, Hazrat Abu Bakr said: "Among all of them, only me?!"

Hazrat Khalid bin Abi Salat narrates that Hazrat Ibn Sirin came to Hazrat Ibn Hubaira and said: "Assalamu Alaikum." Upon this, Hazrat Ibn Hubaira said: "What manner of greeting is this?" He replied: "This is how the Messenger of Allah (peace and blessings be upon him) was greeted."

Hazrat Malik bin Aws bin Hadthan narrates that Hazrat Abu Zar came from Syria and entered the mosque, where Hazrat Usman was present. He said: Assalamu Alaikum.

Hazrat Ibn Abbas (may Allah be pleased with them both) narrates that Hazrat Umar came to the door of the Noble Prophet (peace and blessings be upon him) and said: Peace be upon the Messenger of Allah, assalamu alaikum.

Hasan narrates that Mujalid used to greet Umar in this way: O Commander of the Faithful! Peace be upon you, peace be upon you all, meaning also upon those who are with you.

Hazrat Ibn Aun states that Imam Muhammad considered it disliked to say: "Assalamu Alaik," until it is said: "Assalamu Alaikum."

Hazrat A'mash says that Ibrahim stated: When a person greets another person, even if he is alone, he should say: Assalamu Alaikum, because angels are also with him.

Hazrat Abdul Momin says that I greeted a man who was walking with Hazrat Muslim bin Yasar. I said: Assalamu Alaik. Upon this, Hazrat Muslim said to me: Stop. I said: I know him. He said: Even if you know him. When you greet, say: Assalamu Alaikum, because there are guardian angels with that person as well.