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Surah 3. Aal-Imran
Ayah 118 - 120
118يَـٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوا۟ لَا تَتَّخِذُوا۟ بِطَانَةً مِّن دُونِكُمْ لَا يَأْلُونَكُمْ خَبَالًا وَدُّوا۟ مَا عَنِتُّمْ قَدْ بَدَتِ ٱلْبَغْضَآءُ مِنْ أَفْوَٰهِهِمْ وَمَا تُخْفِى صُدُورُهُمْ أَكْبَرُ ۚ قَدْ بَيَّنَّا لَكُمُ ٱلْـَٔايَـٰتِ ۖ إِن كُنتُمْ تَعْقِلُونَ
119هَـٰٓأَنتُمْ أُو۟لَآءِ تُحِبُّونَهُمْ وَلَا يُحِبُّونَكُمْ وَتُؤْمِنُونَ بِٱلْكِتَـٰبِ كُلِّهِۦ وَإِذَا لَقُوكُمْ قَالُوٓا۟ ءَامَنَّا وَإِذَا خَلَوْا۟ عَضُّوا۟ عَلَيْكُمُ ٱلْأَنَامِلَ مِنَ ٱلْغَيْظِ ۚ قُلْ مُوتُوا۟ بِغَيْظِكُمْ ۗ إِنَّ ٱللَّهَ عَلِيمٌۢ بِذَاتِ ٱلصُّدُورِ
120إِن تَمْسَسْكُمْ حَسَنَةٌ تَسُؤْهُمْ وَإِن تُصِبْكُمْ سَيِّئَةٌ يَفْرَحُوا۟ بِهَا ۖ وَإِن تَصْبِرُوا۟ وَتَتَّقُوا۟ لَا يَضُرُّكُمْ كَيْدُهُمْ شَيْـًٔا ۗ إِنَّ ٱللَّهَ بِمَا يَعْمَلُونَ مُحِيطٌ
[118-120] O Believers, do not take into your confidence any other than the people of your own community for they never miss any opportunity of exploiting any weakness of yours92 They desire that which is harmful to you; their malice has become apparent from what they say, but what they conceal in their hearts is yet far worse. We have made clear to you the signs thereof, and if you are wise, (you will be very cautious in your relations with them.) As for you, you love them but they do not love you, even though you believe in all the revealed Books.93 When they meet you, they say, "We also believe (in. your Prophet and in your Book"), but when they go aside, they bite their finger-tips in their rage against you.- Say to them, "Perish in your rage: Allah knows even that which is hidden in the hearts." They grieve if you are blessed with some good and rejoice if an evil befalls you. But their crafty schemes cannot harm you at all, if you show fortitude and fear Allah in whatever you do. Allah encircles whatever they are doing.
92Here Allah warns the Muslims to guard against the hypocritical attitude of the Jews who lived in the suburbs of Al-Madinah. The two clans, Aus and Khazraj, had been on friendly terms with them from very ancient times and kept sincere relations with them even after embracing Islam. In contrast to this, the Jews, who had turned into the enemies of the Holy Prophet and his mission, could not be friendly with anyone who had joined the new Movement. Accordingly, they kept up an outward show of friendship with the Ansar but in their heart of hearts they had become their bitter enemies. They, however, . exploited this outward friendship and tried to sow seeds of dissension and create chaos in the Muslim Community. They also tried to draw out secrets from the Muslims and pass them on to their enemies. That is why Allah has warned the Muslims that they should not take such people into their confidence.
93That is, "It is strange that the Jews, who themselves are guilty of rejecting your Book, whereas you believe in their Book, the Torah, along with your Book, the Qur'an, should have a grievance against you. There is no reason why they should complain against you: on the other hand, you have a cogent grievance against them for their disbelief in your Book."