The Messenger of Allah ﷺ said, "Every act of kindness is charity. Among the acts of kindness is meeting your brother with a cheerful face and pouring from your bucket into his vessel."
قال رسول الله ﷺ: كل معروف صدقة، ومن المعروف أن تلق أخاك بوجه طلق، وأن تفرغ من دلوك في إنائه.
Ahmad narrated it (14709) from Ishaq bin Isa, who said, "Munkadir bin Muhammad bin Munkadir narrated to us, from his father, from Jabir bin Abdullah," and he mentioned it. Its isnad is hasan because of Munkadir bin Muhammad, and it has been corroborated in the first isnad.