Surah Al-Baqarah, verse 91

وَإِذَا قِيلَ لَهُمْ ءَامِنُوا۟ بِمَآ أَنزَلَ ٱللَّهُ قَالُوا۟ نُؤْمِنُ بِمَآ أُنزِلَ عَلَيْنَا وَيَكْفُرُونَ بِمَا وَرَآءَهُۥ وَهُوَ ٱلْحَقُّ مُصَدِّقًا لِّمَا مَعَهُمْ ۗ قُلْ فَلِمَ تَقْتُلُونَ أَنۢبِيَآءَ ٱللَّهِ مِن قَبْلُ إِن كُنتُم مُّؤْمِنِينَ ﴿٩١﴾

2:91 When it is said to them, “Believe in what Allah has sent down,” they say, “We only believe in what was sent down to us,” and they deny what came afterwards, although it is the truth confirming that which is with them. Say, “Then why did you kill the prophets of Allah before, if you were truly believers?”