Sura al-Ḥashr 59:11

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

a-lam tara ilā lladhīna nāfaqū yaqūlūna liikhwānihimu lladhīna kafarū min ahli l-kitābi lain ukhrijtum lanakhrujanna maʿakum wa-lā nuṭīʿu fīkum aḥadan abadan wa-in qūtiltum lananṣurannakum wallāhu yashhadu innahum la-kādhibūna

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.