Anas ibn Malik reported: The Messenger of Allah, peace and blessings be upon him, said:

لَا تَبَاغَضُوا وَلَا تَحَاسَدُوا وَلَا تَدَابَرُوا وَكُونُوا عِبَادَ اللَّهِ إِخْوَانًا

Do not hate each other, do not envy each other, do not turn away from each other, but rather be servants of Allah as brothers.

Source: Sahih Muslim