﴿ وَلَقَدْ عَهِدْنَآ إِلَىٰٓ ءَادَمَ مِن قَبْلُ فَنَسِىَ وَلَمْ نَجِدْ لَهُۥ عَزْمًۭا ﴾

“AND, INDEED, long ago did We impose Our commandment on Adam; but he forgot it, and We found no firmness of purpose in him.”

(And verily We made a covenant of old) before he ate from the tree; it is also said that this means: before the advent of Muhammad (pbuh) (with Adam) We commanded him not to eat from the tree, (but he forgot) he left what he was commanded to do, (and We found no constancy in him) We found in him no firmness or resoluteness.