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 عَلِيمًا
idh jaʿala alladhīna kafarū fī qulūbihimu l-ḥamiyata ḥamiyyata l-jāhiliyati fa-anzala l-lahu sakīnatahu ʿalā rasūlihi waʿalā l-mu'minīna wa-alzamahum kalimata l-taqwā wakānū aḥaqqa bihā wa-ahlahā wakāna l-lahu bikulli shayin ʿalīman
While the disbelievers had fury in their hearts- the fury of ignorance- God sent His tranquillity down on to His Messenger and the believers and made binding on them [their] promise to obey God, for that was more appropriate and fitting for them. God has full knowledge of all things.
When those who disbelieve had put in their hearts pride and haughtiness - the pride and haughtiness of the time of ignorance, - then Allâh sent down His Sakînah (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 Allâh); and they were well entitled to it and worthy of it. And Allâh is the All-Knower of everything.