佛說處處經 1.18

1.18

"That the Buddha relinquished twenty years of his remaining lifespan is due to three nidānas: first, because worldly people are attached to the body; second, because what was to be taught was already exhausted; third, for fear that evil people would slander him and incur heavy offenses; therefore he entered parinirvāṇa. When the Buddha departed transcending the world, he did not take his body with him, nor did he take his mind with him; it was merely the cessation of suffering. Earth, water, fire, wind, and space are constantly in the world without interruption.