Surah Al-Mu'minun (The Believers), Verse 109

اِنَّهٗ كَانَ فَرِیْقٌ مِّنْ عِبَادِیْ یَقُوْلُوْنَ رَبَّنَاۤ اٰمَنَّا فَاغْفِرْ لَنَا وَارْحَمْنَا وَاَنْتَ خَیْرُ الرّٰحِمِیْنَ ۟

Innahoo kaana fareequm min 'ibaadee yaqooloona Rabbanaaa aamannaa faghfir lanaa warhamnaa wa Anta khairur raahimeen

“"A part of My servants there was, who used to pray 'our Lord! we believe; then do Thou forgive us, and have mercy upon us: For Thou art the Best of those who show mercy!"”

Quran 23:109 (Yusuf Ali Translation)