{That is because Allah is the Protecting Friend} meaning: The Protector {of those who believe, and that the disbelievers have no protecting friend.}
﴿ذَلِك بِأَن الله مولى﴾ يَعْنِي: وليّ (الَّذِينَ آمَنُوا وَأَنَّ الْكَافِرِينَ لَا مَوْلَى