A barrier separates them, while the Purgatory* is occupied by people who recognize each side by their looks. They will call the dwellers of Paradise: “Peace be upon you.” They did not enter (Paradise) through wishful thinking.
وَبَينَهُما حِجابٌ وَعَلَى الأَعرٰفِ رِجالٌ يَعرِفونَ كُلًّا بِسيمىٰهُم وَنادَوا أَصحٰبَ الجَنَّةِ أَن سَلٰمٌ عَلَيكُم لَم يَدخُلوها وَهُم يَطمَعونَ
wa bainahumaa hijaab; wa ‘alal A’raafi rijaaluny ya’rifoona kullam biseemaahum; wa naadaw Ashaabal jannati an salaamun ‘alaikum; lam yadkhuloohaa wa hum yatma’oon
*7:46-49 Initially, there will be 4 places: (1) the High Heaven, (2) the Lower Heaven, (3) the Purgatory, and (4) Hell. The Purgatory will be annexed into the Lower Heaven.