The word(s) "magog" appears 3 time(s) in 3 verse(s) in Quran in Saheeh International translation.

(1) They said, "O Dhul-Qarnayn, indeed Gog and magog are [great] corrupters in the land. So may we assign for you an expenditure that you might make between us and them a barrier?"

(سورة الكهف, Al-Kahf, Chapter #18, Verse #94)
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(2) So Gog and magog were unable to pass over it, nor were they able [to effect] in it any penetration.

(سورة الكهف, Al-Kahf, Chapter #18, Verse #97)
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(3) Until when [the dam of] Gog and magog has been opened and they, from every elevation, descend

(سورة الأنبياء, Al-Anbiyaa, Chapter #21, Verse #96)
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