﴿ وَلَا تَقُولَنَّ لِشَا۟ىْءٍ إِنِّى فَاعِلٌۭ ذَٰلِكَ غَدًا ﴾

“AND NEVER say about anything, "Behold, I shall do this 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