According to muslims? where is the gospel of Jesus mentioned in the Quran?

why do muslims cite the gospels from the new testament? if they are corrupted and according to an islamic comment, the gospel of Jesus are words orally and they are lost? if they are lost, wasn't muhammad the Holy Spirit promised by Jesus in John to confirm jesus'words? then Quran shouldn't speak about the Jesus words because the Quran confirms the Torah, Injeel or gospel,psalms so where is the gospel of Jesus according to Islam?