It is narrated from Sayyiduna Abdullah bin Samit (may Allah be pleased with him), he said: I said to Sayyiduna Abu Dharr (may Allah be pleased with him) that I passed by Abdur Rahman bin Umm al-Hakam and greeted him with salam, but he did not reply to me. He said: My nephew! There is no need for you to be upset. Someone better than him has replied to your salam, that is, the angel on his right side.
Hadith Referenceالادب المفرد / كتاب السلام / 1038
Hadith Gradingالألبانی:صحيح الإسناد موقوفًا على أبى ذر
Hadith Takhrij«صحيح الإسناد موقوفًا على أبى ذر : تفرد به المصنف»
It is narrated from Sayyiduna Abdullah (may Allah be pleased with him), he said: “«السلام» is one of the names of Allah, which Allah has placed on the earth, so spread it among yourselves. Indeed, when a man greets a people with salam, and they reply to him, then the one who greeted has a superiority of one degree, because he reminded them of salam. And if he does not receive a reply, then he receives a reply from a better and purer creation than them.”
Hadith Referenceالادب المفرد / كتاب السلام / 1039
Hadith Gradingالألبانی:صحيح الإسناد موقوفًا و صح مرفوعًا
Hadith Takhrij«صحيح الإسناد موقوفًا و صح مرفوعًا : شعب الإيمان للبيهقى : 432/6 ، ح : 8782»