‘Iyad ibn Himar reported: The Messenger of Allah, peace and blessings be upon him, said:

إِنَّ اللَّهَ أَوْحَى إِلَيَّ أَنْ تَوَاضَعُوا حَتَّى لَا يَبْغِيَ أَحَدٌ عَلَى أَحَدٍ وَلَا يَفْخَرَ أَحَدٌ عَلَى أَحَدٍ

Verily, Allah has revealed to me that you must be humble towards one another, so that no one oppresses another or boasts to another.

Source: Ṣaḥīḥ Muslim 2865, Grade: Sahih