When the disbelievers had filled their hearts with pride

 إِذْ جَعَلَ ٱلَّذِينَ كَفَرُوا۟ فِى قُلُوبِهِمُ ٱلْحَمِيَّةَ حَمِيَّةَ ٱلْجَـٰهِلِيَّةِ فَأَنزَلَ ٱللَّهُ سَكِينَتَهُۥ عَلَىٰ رَسُولِهِۦ وَعَلَى ٱلْمُؤْمِنِينَ وَأَلْزَمَهُمْ كَلِمَةَ ٱلتَّقْوَىٰ وَكَانُوٓا۟ أَحَقَّ بِهَا وَأَهْلَهَا ۚ وَكَانَ ٱللَّهُ بِكُلِّ شَىْءٍ عَلِيمًۭا ٢٦

When those who disbelieve had put in their hearts pride and haughtiness - the pride and haughtiness of the time of ignorance, - then Allah sent down His Sakinah (calmness and tranquillity) upon His Messenger (صلى الله عليه وسلم) and upon the believers, and made them stick to the word of piety (i.e. none has the right to be worshipped but Allah); and they were well entitled to it and worthy of it. And Allah is the All-Knower of everything.

Quran 48:26