Quran 5:111 Al-Ma'idah, ayah 111 of 120

وَإِذْ أَوْحَيْتُ إِلَى ٱلْحَوَارِيِّـۧنَ أَنْ ءَامِنُوا۟ بِى وَبِرَسُولِى قَالُوٓا۟ ءَامَنَّا وَٱشْهَدْ بِأَنَّنَا مُسْلِمُونَ ۝١١١

5:111 And when I inspired the disciples, (saying): Believe in Me and in My messenger, they said: We believe. Bear witness that we have surrendered (unto Thee) "we are muslims".