Help each other in good deeds, but not in sinful deeds

وَتَعَاوَنُواْ عَلَى ٱلۡبِرِّ وَٱلتَّقۡوَىٰ‌ۖ وَلَا تَعَاوَنُواْ عَلَى ٱلۡإِثۡمِ وَٱلۡعُدۡوَٲنِ‌ۚ وَٱتَّقُواْ ٱللَّهَ‌ۖ إِنَّ ٱللَّهَ شَدِيدُ ٱلۡعِقَابِ

Help ye one another in righteousness and piety, but help ye not one another in sin and rancour: fear Allah: for Allah is strict in punishment.

(Qur'an 5:2)