Dalil
العربية

Quran Taha 20:44

فَقُولَا لَهُۥ قَوۡلٗا لَّيِّنٗا لَّعَلَّهُۥ يَتَذَكَّرُ أَوۡ يَخۡشَىٰ

Translation

And speak to him with gentle speech that perhaps he may be reminded or fear [Allāh]."