Separating is mentioned in the Quran in these verses:

[7:46] 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.

[41:5] They said, “Our minds are made up, our ears are deaf to your message, and a barrier separates us from you. Do what you want, and so will we.”

[55:19] He separates the two seas where they meet.

[57:13] On that day, the hypocrite men and women will say to those who believed, “Please allow us to absorb some of your light.” It will be said, “Go back behind you, and seek light.” A barrier will be set up between them, whose gate separates mercy on the inner side, from retribution on the outer side.

To learn more, read the Quran in English.

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