Al-Kahf Verse 23

And never say of anything, “I will definitely do this tomorrow,”

And never say about anything, “I will surely do this tomorrow,”

And do not say, regarding anything, 'I am going to do that tomorrow,'

do not say of anything, ‘I will do that tomorrow,’

And never say thou of a thing: verily I am going to do that on the morrow.

Nor say of anything, "I shall be sure to do so and so tomorrow"-

And never say about anything: "I shall certainly do this tomorrow"

Do not say of any thing: "I will do it tomorrow,"

And never say about anything that, “I will do this tomorrow.”

Do not say about anything, ‘I will indeed do it tomorrow,’

And do not say about anything (you intend), "I will do it tomorrow,"

And never say of anything, `I am going to do it tomorrow,´

And do not say (E) to a thing: "That I am making/doing that tomorrow/(in the) future."

And never say about anything that, "I will do this tomorrow."

Some say, "They were three, and the fourth of them was their dog:" and some say, "Five, and the sixth of them was their dog:" guessing at the unseen: and some say, "Seven, and the eighth of them was their dog." Say, "My Lord knows best the number of them; none knows them but a few. Enter not, therefore, into disputation concerning the matter, except what is clear, and consult not any one of them to pronounce concerning them.

And never say of anything, "I shall do such and such thing tomorrow."

(Some) say: (They were) three, the fourth of them their dog; and (others) say: Five, the sixth of them their dog, making conjectures about the unseen. And (others) say: Seven, and the eighth of them their dog. Say: My Lord best knows their number -- none knows them but a few. So contend not in their matter but with an outward contention, and question not any of them concerning them.

And do not say of anything: Surely I will do it tomorrow,

And say not of anything: Lo! I shall do that tomorrow,

Never say of something, "I shall do it tomorrow,"

Do not say of anything: 'I will do it tomorrow'

And never say of anything, "I shall do such and such thing tomorrow."

never say of anything, "I shall certainly do this tomorrow,"

And never say about anything, “I will do that tomorrow.”

And never say regarding something, that is, for the purpose of [doing] something, `I will indeed do that tomorrow', in other words, [I will do something] at some future [point] in time,

Saying "If Allah wills" when determining to do Something in the Future

Allah says;

وَلَا تَقُولَنَّ لِشَيْءٍ إِنِّي فَاعِلٌ ذَلِكَ غَدًا