It isn't clear that the Quran says that Jesus was crucified. For example, the Penguin translation says “They did not kill him, nor did they crucify him, but they thought they did”, then adds that the literal meaning is “he was made to resemble another for them”. This suggests that a substitute was found for him.

That is also the conclusion of this online source: “This perspective suggests that another man was made to look like Jesus and was crucified in his place. The Quran does not provide explicit details on how this occurred, but it emphasizes that Jesus did not die on the cross as commonly believed in Christian tradition. (Instead, Allah took him up unto Himself)”.