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“Should even one's enemy arrive at the doorstep, he should be attended upon with respect. A tree does not withdraw its cooling shade even from the one who has come to cut it.” ― Mahabharata 12.146.5
The fire-god, Agni, took away the real Sītā and brought her to the place of Pārvatī, goddess Durgā. An illusory form of mother Sītā was then delivered to Rāvaṇa, and in this way Rāvaṇa was cheated.