Tawhīd (monotheism and exclusive worship of Allah)

وَلَا يَأْمُرَكُمْ أَن تَتَّخِذُوا۟ ٱلْمَلَـٰٓئِكَةَ وَٱلنَّبِيِّـۧنَ أَرْبَابًا ۗ أَيَأْمُرُكُم بِٱلْكُفْرِ بَعْدَ إِذْ أَنتُم مُّسْلِمُونَ

Nor could he order you to take the angels and prophets as lords. Would he order you to disbelief after you had been Muslims?