The Prophet ﷺ addressed them in a sermon and said, "Allah has revealed to me that you should be humble toward one another, so that no one boasts over another."
حدثنا أحمد بن سعيد حدثنا علي بن الحسين بن واقد حدثنا أبي عن مطر عن قتادة عن مطرف
عن النبي ﷺ أنه خطبهم فقال إن الله عز وجل أوحى إلي أن تواضعوا حتى لا يفخر أحد على أحد
Reported by Muslim, The Book of Paradise and Its Delights, Chapter on the Traits by Which the People of Paradise and the People of Hellfire Are Known in This World, hadith no. 64/2865, from the hadith of Husayn bin Waqid, through this route.