Surah Al-Ma'idah, Verse 111

وَإِذۡ أَوۡحَيۡتُ إِلَى ٱلۡحَوَارِيِّـۧنَ أَنۡ ءَامِنُواْ بِي وَبِرَسُولِي قَالُوٓاْ ءَامَنَّا وَٱشۡهَدۡ بِأَنَّنَا مُسۡلِمُونَ١١١

wa-idh awḥaytu ilā l-ḥawāriyīna an āminū bī wabirasūlī qālū āmannā wa-ish'had bi-annanā mus'limūna

And [remember] when I inspired to the disciples, "Believe in Me and in My messenger [i.e., Jesus]." They said, "We have believed, so bear witness that indeed we are Muslims [in submission to Allāh]."