وَإِذَا قِيلَ لَهُمْ ءَامِنُوا۟ بِمَآ أَنزَلَ ٱللَّهُ قَالُوا۟ نُؤْمِنُ بِمَآ أُنزِلَ عَلَيْنَا وَيَكْفُرُونَ بِمَا وَرَآءَهُۥ وَهُوَ ٱلْحَقُّ مُصَدِّقًۭا لِّمَا مَعَهُمْ ۗ قُلْ فَلِمَ تَقْتُلُونَ أَنۢبِيَآءَ ٱللَّهِ مِن قَبْلُ إِن كُنتُم مُّؤْمِنِينَ
And when it is said to them, "Believe in what Allah has revealed," they say, "We believe [only] in what was revealed to us." And they disbelieve in what came after it, while it is the truth confirming that which is with them. Say, "Then why did you kill the prophets of Allah before, if you are [indeed] believers?"
And when it was said to them, ‘Believe in what God has revealed, that is, the Qur’ān and other [Books], they said, ‘We believe in what was revealed to us’, that is, the Torah; and (wā, here indicates a circumstantial qualifier) they disbelieve in what is beyond that, what is other than that or what came afterwards, such as the Qur’ān; yet it is the truth (wa-huwa’l-haqqu is a circumstantial qualifier) confirming (musaddiqan, a second circumstantial qualifier for emphasis) what is with them. Say, to them: ‘Why then were you slaying the prophets of God formerly, if you were believers?’ in the Torah and in it you were forbidden to kill them: this address, concerning what their forefathers did, is directed towards those present at the time of our Prophet, on account of their approval of it [that is, of what the forefathers had done].