Al-Hashr 59:11

۞ أَلَمْ تَرَ إِلَى ٱلَّذِينَ نَافَقُوا۟ يَقُولُونَ لِإِخْوَٰنِهِمُ ٱلَّذِينَ كَفَرُوا۟ مِنْ أَهْلِ ٱلْكِتَٰبِ لَئِنْ أُخْرِجْتُمْ لَنَخْرُجَنَّ مَعَكُمْ وَلَا نُطِيعُ فِيكُمْ أَحَدًا أَبَدًۭا وَإِن قُوتِلْتُمْ لَنَنصُرَنَّكُمْ وَٱللَّهُ يَشْهَدُ إِنَّهُمْ لَكَٰذِبُونَ

Hast thou not observed the Hypocrites say to their misbelieving brethren among the People of the Book? - "If ye are expelled, we too will go out with you, and we will never hearken to any one in your affair; and if ye are attacked (in fight) we will help you". But Allah is witness that they are indeed liars.