لـٰكِنِ اللَّهُ يَشهَدُ بِما أَنزَلَ إِلَيكَ ۖ أَنزَلَهُ بِعِلمِهِ ۖ وَالمَلائِكَةُ يَشهَدونَ ۚ وَكَفىٰ بِاللَّهِ شَهيدًا

God Himself bears witness to what He revealed to you. He revealed it with His knowledge, and the angels also bear witness. Yet, God is sufficient as a Witness.