Translation for 53:18

لَقَدۡ رَأَىٰ مِنۡ ءَايَٰتِ رَبِّهِ ٱلۡكُبۡرَىٰٓ ١٨
He certainly saw some of his Lord’s greatest signs.1 

Foot notes

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 The Prophet was taken to heaven to see some of Allah’s magnificent signs. He only saw what he was told to see.