Sayyiduna Abdullah bin Amr bin al-As (may Allah be pleased with him) narrates that one day a man asked the Prophet Muhammad (peace and blessings be upon him): "Which Islam is best?" He replied: "That you feed (others) and greet with peace both those whom you know and those whom you do not know—in short, greet everyone with peace."
Hadith Referenceاللؤلؤ والمرجان / كتاب الايمان / 24
Hadith Gradingمحدثین:«صحیح»
Hadith Takhrij«صحیح، أخرجه البخاري في: 2 كتاب الإيمان: 6 باب إطعام الطعام من الإسلام»