Monasticism
Answer
Then We sent Our Messengers following in their footsteps and sent ‘Isa son of Maryam after them, giving him the Gospel. We put compassion and mercy in the hearts of those who followed him. They invented monasticism–We did not prescribe it for them–purely out of desire to gain the pleasure of Allah, but even so they did not observe it as it should have been observed. To those of them who believed We gave their reward but many of them are deviators. (57:27)