Abu Dharr (May Allah be pleased with him) reported:
The Messenger of Allah (ﷺ) said to me, "Do not belittle any good deed, even your meeting with your brother (Muslim) with a cheerful face."[Muslim]. (FR)
App reference (FR): Book 6, Hadith 48 (FR)
Arabic/English book reference (FR): Book 6, Hadith 892 (FR)