Surah Al-Ma'idah 5:18

وَقَالَتِ ٱلْيَهُودُ وَٱلنَّصَـٰرَىٰ نَحْنُ أَبْنَـٰٓؤُا۟ ٱللَّهِ وَأَحِبَّـٰٓؤُهُۥ ۚ قُلْ فَلِمَ يُعَذِّبُكُم بِذُنُوبِكُم ۖ بَلْ أَنتُم بَشَرٌ مِّمَّنْ خَلَقَ ۚ يَغْفِرُ لِمَن يَشَآءُ وَيُعَذِّبُ مَن يَشَآءُ ۚ وَلِلَّهِ مُلْكُ ٱلسَّمَـٰوَٰتِ وَٱلْأَرْضِ وَمَا بَيْنَهُمَا ۖ وَإِلَيْهِ ٱلْمَصِيرُ

But the Jews and the Christians say, "We are the children of Allāh and His beloved." Say, "Then why does He punish you for your sins?" Rather, you are human beings from among those He has created. He forgives whom He wills, and He punishes whom He wills. And to Allāh belongs the dominion of the heavens and the earth and whatever is between them, and to Him is the [final] destination.

Translation: Saheeh International

Tafsir

The Jews and Christians both of them say ‘We are the sons of God that is we are like his sons in terms of closeness and rank and He is like a father to us in terms of compassion and care and His beloved ones’. Say to them O Muhammad (s) ‘Why then does He chastise you for your sins? if what you say is true. …

Excerpt from Tafsir al-Jalalayn, commentary on 5:18, via Quran.com. The reader has the full commentary and 9 more tafsirs.