ادْخُلِ الْجَنَّةَ

("Enter Paradise.") so he entered it with all its bountiful provision, when Allah had taken away from him all the sickness, grief and exhaustion of this world. Mujahid said, "It was said to Habib An-Najjar, `Enter Paradise.' This was his right, for he had been killed. When he saw the reward,

قَالَ يلَيْتَ قَوْمِى يَعْلَمُونَ

Verse 26 states: قِيلَ ادْخُلِ الْجَنَّةَ ۖ قَالَ يَا لَيْتَ قَوْمِي يَعْلَمُونَ ﴿26﴾ بِمَا غَفَرَ‌ لِي رَ‌بِّي وَجَعَلَنِي مِنَ الْمُكْرَ‌مِينَ ﴿27﴾(it was said to him, " Enter the paradise". He said,"Would that my people knew how my Lord has forgiven me and placed me among the honored ones!" - 26, 27), that is, it was said to the person who had come from the farthest part of the city to prompt people to believe in the messengers, "Enter Paradise."

It is obvious that this address was communicated through some angel who told him to go into the Paradise. In fact, the essential sense of asking him to enter Paradise is to give him the good news that his place in Paradise is a settled matter which would translate into reality at its appointed time after going through the process of Resurrection. (Qurtubi)