Sunan at-Tirmithiy كتاب الإيمان باب ما جاء فى أن المسلم من سلم المسلمون من لسانه ويده
The Messenger of God, peace and blessings of God be upon him, said, "The [perfect] Muslim is the one whose hands and tongue do not harm Muslims; and the [perfect] believer is the one whom people entrust with their lives and wealth." Click on ḥadīth to read more