اَلَّذِيْنَ اٰتَيْنٰهُمُ الْكِتٰبَ مِنْ قَبْلِهٖ هُمْ بِهٖ يُؤْمِنُوْنَ ( القصص: ٥٢ )
Allazeena aatainaahu mul Kitaaba min qablihee hum bihee yu'minoon (al-Q̈aṣaṣ 28:52)
Those to whom We gave the Scripture before it – they are believers in it. (Al-Qasas  : 52)
1 Mufti Taqi Usmani
As for those to whom We gave the Book before this, they believe in it (Qur’ān).