sita lana rakhilena parvatira sthane
'maya-sita' diya agni vancila ravane
sita lana—taking away mother Sita; rakhilena—kept; parvatira sthane—with mother Parvati, or goddess Durga; maya-sita—the false, illusory form of Sita; diya—delivering; agni—fire-god; vancila—cheated; ravane—the demon Ravana.
The fire-god, Agni, took away the real Sita and brought her to the place of Parvati, goddess Durga. An illusory form of mother Sita was then delivered to Ravana, and in this way Ravana was cheated.
Link to this page: https://prabhupadabooks.com/cc/madhya/9/204