Ram Siya ke Luv Kush

Sita's condition to Rishi Valmiki (1x3)

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After Sita single-handedly tackled a couple of ferocious wolves in the jungle, she meets an ascetic who introduces himself as Rishi Valmiki. On his insistence, she agrees to stay at his ashram but puts forth a condition before him, leaving him confused! What condition does Sita put before Rishi Valmiki and why?