3:118
يَا أَيُّهَا الَّذِينَ آمَنُواْ لاَ تَتَّخِذُواْ بِطَانَةً مِّن دُونِكُمْ لاَ يَأْلُونَكُمْ خَبَالاً وَدُّواْ مَا عَنِتُّمْ قَدْ بَدَتِ الْبَغْضَاء مِنْ أَفْوَاهِهِمْ وَمَا تُخْفِي صُدُورُهُمْ أَكْبَرُ قَدْ بَيَّنَّا لَكُمُ الآيَاتِ إِن كُنتُمْ تَعْقِلُونَ
O ye who believe! Take not into your intimacy those outside your ranks: They will not fail to corrupt you. They only desire your ruin: Rank hatred has already appeared from their mouths: What their hearts conceal is far worse. We have made plain to you the Signs, if ye have wisdom.
9:16
أَمْ حَسِبْتُمْ أَن تُتْرَكُواْ وَلَمَّا يَعْلَمِ اللّهُ الَّذِينَ جَاهَدُواْ مِنكُمْ وَلَمْ يَتَّخِذُواْ مِن دُونِ اللّهِ وَلاَ رَسُولِهِ وَلاَ الْمُؤْمِنِينَ وَلِيجَةً وَاللّهُ خَبِيرٌ بِمَا تَعْمَلُونَ
Or think ye that ye shall be abandoned, as though Allah did not know those among you who strive with might and main, and take none for friends and protectors except Allah, His Messenger, and the (community of) Believers? But Allah is well-acquainted with (all) that ye do.