Sahih al-Bukhari 3941
Sahih al-Bukhari · Book 63: Merits of the Helpers in Madinah (Ansaar) · The coming of the Jews to the Prophet (saws) on his arrival at Al-Madina
Narrated Abu Huraira:
حَدَّثَنَا مُسْلِمُ بْنُ إِبْرَاهِيمَ ، حَدَّثَنَا قُرَّةُ ، عَنْ مُحَمَّدٍ ، عَنْ أَبِي هُرَيْرَةَ ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " لَوْ آمَنَ بِي عَشَرَةٌ مِنَ الْيَهُودِ لآمَنَ بِي الْيَهُودُ " .
The Prophet (ﷺ) said, "Had only ten Jews (amongst their chiefs) believe me, all the Jews would definitely have believed me."