Jabir reported that the Messenger of Allah, may Allah bless himand grant him peace, said, "Every act of kindness is sadaqa. Part of kindnessis that you offer your brother a cheerful face and you pour some of yourbucket into his water vessel." (ID)
English reference (ID): Book 14, Hadith 304 (ID)
Arabic reference (ID): Book 1, Hadith 304 (ID)