The Jataka, Vol. II: Book II. Dukanipāta: No. 237. Sāketa-Jātaka
The Jataka, Vol. II, tr. by W.H.D. Rouse, [1895]
"Why are hearts cold," etc.--This story the Master told during a stay near Sāketa, about a brahmin named Sāketa. Both the circumstances that suggested the story and the story itself have already been given in the First Book 3.
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[235]...And when the Tathāgata had gone to the monastery, the Brother asked, "How, Sir, did the love begin? "and repeated the first stanza:--
The Master explained the nature of love by the second stanza:
After this discourse was ended, the Master identified the Birth:--"These two people were the brahmin and his wife in the story; and I was their son."
162:3 No. 68.