Surah Al-Baqarah 2:76

وَإِذَا لَقُوا۟ ٱلَّذِينَ ءَامَنُوا۟ قَالُوٓا۟ ءَامَنَّا وَإِذَا خَلَا بَعْضُهُمْ إِلَىٰ بَعْضٍ قَالُوٓا۟ أَتُحَدِّثُونَهُم بِمَا فَتَحَ ٱللَّهُ عَلَيْكُمْ لِيُحَآجُّوكُم بِهِۦ عِندَ رَبِّكُمْ ۚ أَفَلَا تَعْقِلُونَ

And when they meet those who believe, they say, "We have believed"; but when they are alone with one another, they say, "Do you talk to them about what Allāh has revealed to you so they can argue with you about it before your Lord?" Then will you not reason?

Translation: Saheeh International

Tafsir

And when they the hypocrites from among the Jews meet those who believe they say ‘We believe’ that Muhammad (s) is a prophet and that he is the one of whom we have been given good tidings in our Book; …

Excerpt from Tafsir al-Jalalayn, commentary on 2:76, via Quran.com. The reader has the full commentary and 9 more tafsirs.