A key Qur’anic proof-text for Gospel incorruption was misread by its own citing author.

Evidence

In the tractate al-hijr, God is brought in, saying: We have caused a reminder to go down, and We are its guardian, Yet, so the Muslims say, he calls the Law and the Gospel the reminder of God, which, as God Himself guards it, is not corrupt, unless God is not Himself a faithful guardian; quod absit. — Norman Daniel, Islam and the West, 291