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 your brother's vessel."
قال رسول الله ﷺ: كل معروف صدقة، ومن المعروف أن تلقى أخاك بوجه طلق، وأن تفرغ من دلوك في إناء أخيك.
Tirmidhi (1970), Ahmad (14877), and Bukhari in Adab al-Mufrad (304) all narrated it, all of them from Qutayba bin Saeed, who said, Munkadir bin Muhammad bin Munkadir related to us, from his father, from Jabir bin Abdullah, and he mentioned it.Its chain of transmission is hasan because of Munkadir bin Muhammad bin Munkadir, for the prevailing view of him is that of weakness, but Imam Ahmad said, "He is trustworthy," and Ibn Main said, "There is no harm in him."I say, if it becomes clear that he did not err, and his hadith has a sahih basis, then his hadith is judged hasan, otherwise not. Perhaps for this reason Tirmidhi said, "This is a hasan sahih hadith."