18. Al-Kahf (The Cave)

Surah: 18   Aya: 24

24. Illa an yashaa Allahu waothkur rabbaka itha naseeta waqul AAasa an yahdiyani rabbee li-aqraba min hatha rashadan
  

  Translation

24. Except (with the saying), "If Allâh will!" And remember your Lord when you forget and say: "It may be that my Lord guides me unto a nearer way of truth than this."