وَلَا تَقُولَنَّ لِشَا۟ىْءٍ إِنِّى فَاعِلٌ ذَٰلِكَ غَدًا

And never say of anything, "Indeed, I will do that tomorrow,"

الكهف 23

إِلَّآ أَن يَشَآءَ ٱللَّهُ ۚ وَٱذْكُر رَّبَّكَ إِذَا نَسِيتَ وَقُلْ عَسَىٰٓ أَن يَهْدِيَنِ رَبِّى لِأَقْرَبَ مِنْ هَـٰذَا رَشَدًا

Except [when adding], "If Allāh wills." And remember your Lord when you forget [it] and say, "Perhaps my Lord will guide me to what is nearer than this to right conduct."

الكهف 24

أَفَمَن شَرَحَ ٱللَّهُ صَدْرَهُۥ لِلْإِسْلَـٰمِ فَهُوَ عَلَىٰ نُورٍ مِّن رَّبِّهِۦ ۚ فَوَيْلٌ لِّلْقَـٰسِيَةِ قُلُوبُهُم مِّن ذِكْرِ ٱللَّهِ ۚ أُو۟لَـٰٓئِكَ فِى ضَلَـٰلٍ مُّبِينٍ

So is one whose breast Allāh has expanded to [accept] Islām and he is upon [i.e., guided by] a light from his Lord [like one whose heart rejects it]? Then woe to those whose hearts are hardened against the remembrance of Allāh. Those are in manifest error.

الزمر 22

وَمَا يَذْكُرُونَ إِلَّآ أَن يَشَآءَ ٱللَّهُ ۚ هُوَ أَهْلُ ٱلتَّقْوَىٰ وَأَهْلُ ٱلْمَغْفِرَةِ

And they will not remember except that Allāh wills. He is worthy of fear and adequate for [granting] forgiveness.

المدثر 56

فَمَن شَآءَ ذَكَرَهُۥ

Then whoever wills will remember it.

المدثر 55