﴿ ٱلَّذِينَ ءَاتَيْنَٰهُمُ ٱلْكِتَٰبَ يَعْرِفُونَهُۥ كَمَا يَعْرِفُونَ أَبْنَآءَهُمْ ۖ وَإِنَّ فَرِيقًۭا مِّنْهُمْ لَيَكْتُمُونَ ٱلْحَقَّ وَهُمْ يَعْلَمُونَ ﴾

“They unto whom We have vouchsafed revelation aforetime know it as they know their own children: but, behold, some of them knowingly suppress the truth -”

Then Allah mentions the believers of the people of the Book, saying: (Those unto whom We gave the Scripture) gave the knowledge of the Torah, 'Abdullah ibn Salam and his followers (recognise) know Muhammad (pbuh) with his description and traits (as they recognise their children) in the midst of other children. (But lo! A party of them) of the people of the Book (knowingly) knowing it to exist in their Book (conceal the Truth) conceal the description and traits of Muhammad (pbuh).