Abu Dharr (May Allah be pleased with him) reported:
Messenger of Allah ﷺ said, "Do not disdain a good deed, (no matter how small it may seem) even if it is your meeting with your (Muslim) brother with a cheerful face."

[Muslim].

وعن أبي ذر رضي الله عنه قال: قال لي رسول الله ﷺ :
"لا تحقرن من المعروف شيئاً، ولو أن تلقى أخاك بوجه طلق" ((رواه مسلم)).