Sahih Muslim Book 32, Hadith Number 6221.

Chapter : It is forbidden to populate atrocity upon a Muslim, to humiliate him, to insult him, and inviolable is his blood, honour and wealth.

Abu Huraira reported Allah’s Messenger (may peace be upon him) as saying: Verily Allah does not look to your faces and your wealth but He looks to your heart and to your deeds.