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

“For, when they meet those who have attained to faith. they say, "We believe [as you believe]" - but when they find themselves alone with one another, they say. "Do you inform them of what God has disclosed to you, so that they might use it in argument against you, quoting the words of your Sustainer? Will you not. then, use your reason?"”

Some of the Jews, seeing the growing power of the Muslims in Madinah and around it, pretended to have accepted Islam. In order to assure the Muslims of their sincerity and to win their favour, these hypocrites would now and then disclose to them that the Torah itself had given out the good tidings of the coming of the Holy Prophet ﷺ and mentioned the Holy Qur'an. But when they met other Jews who openly declared their adherence to Judaism, they would admit that they were only trying to deceive the Muslims, and were otherwise quite loyal to their own faith. On such occasions, those of the other group used to reprimand them for revealing to the Muslims what they themselves were trying to keep concealed, for a knowledge of the relevant verses of the Torah could be very useful for the Muslims in order to defeat the Jews in their argument.