Al-Baqara 2:76

And when they meet the believers they say, “We believe.” But when they[36] meet one another in private they say, “Are you telling them what Allah has revealed to you [about Mohammad], so that they may argue against you before your Lord? Have you no sense?”

[36] i.e., the Jews.

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?

76. And when they (Jews) meet those who believe (Muslims), they say, "We believe", but when they meet one another in private, they say, "Shall you (Jews) tell them (Muslims) what Allâh has revealed to you [Jews, about the description and the qualities of Prophet Muhammad صلى الله عليه وسلم, that which are written in the Taurât (Torah)][17], that they (Muslims) may argue with you (Jews) about it before your Lord?" Have you (Jews) then no understanding?

[17] (V.2:76) See the footnote of (V.2:42)

And when they fall in with those who believe, they say: We believe. But when they go apart one with another they say: Prate ye to them of that which Allah hath disclosed to you that they may contend with you before your Lord concerning it? Have ye then no sense?