Surah Al-Kahf (The Cave), Verse 24

اِلَّاۤ اَنْ یَّشَآءَ اللّٰهُ وَاذْكُرْ رَّبَّكَ اِذَا نَسِیْتَ وَقُلْ عَسٰۤی اَنْ یَّهْدِیَنِ رَبِّیْ لِاَقْرَبَ مِنْ هٰذَا رَشَدًا ۟

Illaaa any yashaaa'al laah; wazkur Rabbaka izaa naseeta wa qul 'asaaa any yahdiyani Rabbee li aqraba min haazaa rashadaa

“Without adding, "So please Allah!" and call thy Lord to mind when thou forgettest, and say, "I hope that my Lord will guide me ever closer (even) than this to the right road."”

Quran 18:24 (Yusuf Ali Translation)