Quran 40:50 Ghafir, ayah 50 of 85

قَالُوٓا۟ أَوَلَمْ تَكُ تَأْتِيكُمْ رُسُلُكُم بِٱلْبَيِّنَـٰتِ ۖ قَالُوا۟ بَلَىٰ ۚ قَالُوا۟ فَٱدْعُوا۟ ۗ وَمَا دُعَـٰٓؤُا۟ ٱلْكَـٰفِرِينَ إِلَّا فِى ضَلَـٰلٍ ۝٥٠

40:50 They say: Came not your messengers unto you with clear proofs? They say: Yea, verily. They say: Then do ye pray, although the prayer of disbelievers is in vain.