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Isn't there a verse in Quran about a nation that seems to be promoting peace but actually they are not? Thank you for your help

Then We sent following their footsteps Our messengers and followed [them] with Jesus, the son of Mary, and gave him the Gospel. And We placed in the hearts of those who followed him compassion and mercy and monasticism, which they innovated; We did not prescribe it for them except [that they did so] seeking the approval of Allah . But they did not observe it with due observance. So We gave the ones who believed among them their reward, but many of them are defiantly disobedient.
QS. 57:27

To me, it means the Quran, knows that monasticism was an innovation (gnostic influenced), not prescribed by God, way long before Protestant Reformation developed (around 14th century). And that many of the monastics, namely the Priests, were disobedient of Allah. Or where there already an issue on monasticism as innovation in 6th-7th century Arabia? Any thoughts?
Probably this verse is also a sign, a fingerprint of authority in Quran.