﴿ ۞ 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 ﴾

“ART THOU NOT aware of how those who would always dissemble [their real feelings] speak to their truth-denying brethren from among the followers of earlier revelation: “If you are driven away, we shall most certainly go forth with you, and shall never pay heed to anyone against you; and if war is waged against you, we shall most certainly come to your succour.” But God bears witness that they are most flagrantly lying:”

Please check ayah 59:17 for complete tafsir.