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Al-Adab al-Mufrad 426
وَقَالَ النَّبِيُّ صلى الله عليه وسلم: إِنَّ اللَّهَ عَزَّ وَجَلَّ أَوْحَى إِلَيَّ أَنْ تَوَاضَعُوا، وَلاَ يَبْغِ بَعْضُكُمْ عَلَى بَعْضٍ.
The Prophet, may Allah bless him and grant him peace, said, "Allah Almighty revealed to me that you should be humble and that you should not wrong one another."
Cited in Al-Adab al-Mufrad (No. 426).