يَا أَيُّهَا الَّذِينَ آمَنُوا لَا تَتَّبِعُوا خُطُوَاتِ الشَّيْطَانِ ۚ وَمَن يَتَّبِعْ خُطُوَاتِ الشَّيْطَانِ فَإِنَّهُ يَأْمُرُ بِالْفَحْشَاءِ وَالْمُنكَرِ...

To follow in the footsteps of Satan means acting upon his secret evil promptings. When for no reason at all the mind of an individual is suddenly flooded by feelings of suspicion, when a man begins harbouring negative thoughts about his opponents, it is the insidious work of Satan. Therefore, when such thoughts and feelings take shape, man should, instead of cultivating them, immediately root them out from his heart. To cultivate such feelings amounts to following Satan.To raise a hue and cry against others is inconsistent with humility. There are certain individuals who have very high opinions of themselves, while holding unduly bad opinions about others. Neither trait is in consonance with faith. If a man cultivates faith-oriented humbleness, he becomes so engrossed in introspection that he has absolutely no time to engage himself in unfair criticism of others or in calling others to account.

— Source: Tazkirul Quran (Maulana Wahiduddin Khan) via Quran.com (24:21)