أَلَم تَرَ أَنَّ اللَّهَ يَعلَمُ ما فِي السَّماواتِ وَما فِي الأَرضِ ۖ ما يَكونُ مِن نَجوىٰ ثَلاثَةٍ إِلّا هُوَ رابِعُهُم وَلا خَمسَةٍ إِلّا هُوَ سادِسُهُم وَلا أَدنىٰ مِن ذٰلِكَ وَلا أَكثَرَ إِلّا هُوَ مَعَهُم أَينَ ما كانوا ۖ ثُمَّ يُنَبِّئُهُم بِما عَمِلوا يَومَ القِيامَةِ ۚ إِنَّ اللَّهَ بِكُلِّ شَيءٍ عَليمٌ

Are you not aware that God knows everything in the heavens and on earth? No three people converse in secret, but He is their fourth, nor among five, but He is their sixth. Regardless of their number, He is with them wherever they may be. Then, on Resurrection Day, He will inform them of what they did. God is fully aware of everything.