6:20
ٱلَّذِينَ ءَاتَيْنَـٰهُمُ ٱلْكِتَـٰبَ يَعْرِفُونَهُۥ كَمَا يَعْرِفُونَ أَبْنَآءَهُمُ ۘ ٱلَّذِينَ خَسِرُوٓا۟ أَنفُسَهُمْ فَهُمْ لَا يُؤْمِنُونَ
alladhīna ātaynāhumu l-kitāba yaʿrifūnahu kamā yaʿrifūna abnāahumu alladhīna khasirū anfusahum fahum lā yu'minūna
Those to whom We have given the Scripture know this as well as they know their own sons. Those who have lost their souls will not believe.
Those to whom We have given the Scripture (Jews and Christians) recognize him (i.e. Muhammad صلى الله عليه وسلم as a Messenger of Allâh, and they also know that there is no Ilâh (God) but Allâh and Islâm is Allâh’s Religion), as they recognize their own sons. Those who have lost (destroyed) themselves will not believe. (Tafsir At-Tabarî).