An-Nisa' - 4:63

أُولَـئِكَ الَّذِينَ يَعْلَمُ اللّهُ مَا فِي قُلُوبِهِمْ فَأَعْرِضْ عَنْهُمْ وَعِظْهُمْ وَقُل لَّهُمْ فِي أَنفُسِهِمْ قَوْلاً بَلِيغًا
[4:63]
These are they of whom Allah knows what is in their hearts; therefore turn aside from them and admonish them, and speak to them effectual words concerning themselves.
Those men,-Allah knows what is in their hearts; so keep clear of them, but admonish them, and speak to them a word to reach their very souls.
Those are they, the secrets of whose hearts Allah knoweth. So oppose them and admonish them, and address them in plain terms about their souls.