Surah 5 : Ayah 111

وَإِذْ أَوْحَيْتُ إِلَى ٱلْحَوَارِيِّـۧنَ أَنْ ءَامِنُوا۟ بِى وَبِرَسُولِى قَالُوٓا۟ ءَامَنَّا وَٱشْهَدْ بِأَنَّنَا مُسْلِمُونَ

And [remember] when I inspired the disciples, “Believe in Me and in My messenger [i.e., Jesus].” They said, “We believe, and bear witness that we submit to Allah [as Muslims].”