God teaches us how to greet with each other. We are supposed to say "Salamun Alaykum." But, the majority of us are Quran rejectors. We do not like God's teaching. We say "Assalamu Alaykum" instead of "Salamun Alaykum"! Please examine the following verses of the Quran:
[6:54] When those who believe in our revelations come to you, you shall say, "Salamun Alaykum (Peace be upon you). Your Lord has decreed that mercy is His attribute. Thus, anyone among you who commits a transgression out of ignorance, and repents thereafter and reforms, then He is Forgiving, Most Merciful."
[7:46] A barrier separates them, while the Purgatory* is occupied by people who recognize each side by their looks. They will call the dwellers of Paradise: "Salamun Alaykum." They did not enter (Paradise) through wishful thinking.
[13:24] "Salamun Alaykum, because you steadfastly persevered. What a joyous destiny."
[16:32] The angels terminate their lives in a state of righteousness, saying, "Salamun Alaykum. Enter Paradise (now) as a reward for your works."*
[19:47] He said, "Salamun Alayka. I will implore my Lord to forgive you; He has been Most Kind to me.
[28:55] When they come across vain talk, they disregard it and say, "We are responsible for our deeds, and you are responsible for your deeds. Salamun Alaykum. We do not wish to behave like the ignorant ones."
[39:73] Those who reverenced their Lord will be led to Paradise in throngs. When they get to it, and its gates are opened, its guards will say, "Salamun Alaykum; you have won. Therefore, you abide herein forever."
Thank you and may God guide us,