AL BAQARAH — Ayat 140

أَمْ تَقُولُونَ إِنَّ إِبْرَاهِيمَ وَإِسْمَاعِيلَ وَإِسْحَاقَ وَيَعْقُوبَ وَالأسْبَاطَ كَانُواْ هُودًا أَوْ نَصَارَى قُلْ أَأَنتُمْ أَعْلَمُ أَمِ اللّهُ وَمَنْ أَظْلَمُ مِمَّن كَتَمَ شَهَادَةً عِندَهُ مِنَ اللّهِ وَمَا اللّهُ بِغَافِلٍ عَمَّا تَعْمَلُونَ

Or do you say that Abraham and Ishmael and Isaac and Jacob and the Descendants were Jews or Christians? Say, "Are you more knowing or is Allah ?" And who is more unjust than one who conceals a testimony he has from Allah ? And Allah is not unaware of what you do.