And never say of anything, "Indeed, I will do that tomorrow," (18:23)

﴿وَلَا تَقُولَنَّ لِشَيْءٍ إِنِّي فَاعِلٌ ذَٰلِكَ غَدًا﴾
[ الكهف: 23]

18:23 And never say of anything, "Indeed, I will do that tomorrow,"

Do not say - O Prophet - about anything that you want to do tomorrow: “I am going to do this tomorrow,” because you do not know whether you will do it or you will be prevented from doing so? This is a directive for every Muslim.

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

phonetic Transliteration

Wala taqoolanna lishayin innee faAAilun thalika ghadan

Abdullah Yusuf Ali - Translation

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

Safi-ur-Rahman al-Mubarakpuri

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

Page 296 English transliteration