Original sentence: It was developed by the Mahayana school in the 3rd century Avatamsaka Sutra and later by the Huayan school between the 6th and 8th centuries.The metaphor's earliest known reference is found in the Atharva Veda
Edited sentence: The metaphor was developed by the Mahayana school in the 3rd century Avatamsaka Sutra and later by the Huayan school between the 6th and 8th centuries