Sunan at-Tirmithiy كتاب البر والصلة باب ما جاء فى طلاقة الوجه وحسن البشر
The Messenger of God, peace and blessings of God be upon him, said: "Every act of goodness is charity, and indeed, among the acts of goodness is meeting your brother with a cheerful countenance and pouring from your bucket into your brother's vessel." Click on ḥadīth to read more