Al-Kahf • EN-AL-JALALAYN
﴿ 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