And We shall remove from their hearts any lurking sense of injury;- beneath them will be rivers flowing;- and they shall say: “Praise be to Allah, who hath guided us to this (felicity): never could we have found guidance, had it not been for the guidance of Allah: indeed it was the truth, that the messengers of our Lord brought unto us.” And they shall hear the cry: “Behold! the garden before you! Ye have been made its inheritors, for your deeds (of righteousness).”
According to Daud Abdul-Fattah,
“God raised Adam and Eve to the Garden to enhance their knowledge and relationship with Him. Ibn Kathir stated that the majority of exegetes favoured the opinion that this was the eternal heavenly Paradise. Due to the instigation from Satan, Adam and Eve disobeyed Allah in “tasting” of the forbidden tree. Consequently, they were expelled to earth. It could be surmised that their entry to Janna was for their own edification to demonstrate they were not yet ready for it since they were incapable of fully obeying God’s commands. They needed to return to earth to first conduct self improvement to develop the state of nafs mutma’ina (contented soul at peace), for whom God declares the reward, “Enter you then among My devotees! Enter you My Heaven!” (al-Fajr 89:27–30).
(Adam and Eve’s Origin: A Theory Harmonising Scientific Evidence with the Qur’anic Text pg. 500)
Daud Abdul-Fattah Batchelor (2017) Adam and Eve’s Origin: A Theory Harmonising Scientific Evidence with the Qur’anic Text, Theology and Science, 15:4, 490-508, DOI: 10.1080/14746700.2017.1369762