Al-Kahf 23

وَلَا تَقُولَنَّ لِشَا۟ىْءٍ إِنِّى فَاعِلٌ ذَٰلِكَ غَدًا ﴿٢٣﴾

Wala taqoolanna lishayin innee faAAilun thalika ghadan

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