For the source text click/tap here: Bava Metiza 47
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According to Levi, a Kinyan Chalipin is accomplished by the seller giving an object to the buyer.
The Gemara explains that the pleasure that the seller receives as a result of the buyer's acceptance of his object causes the seller to have full intent (Gemiras Da'as) to transfer ownership of the second object to the buyer.
The prooftext used to identify a tannaitic dispute comes from Ruth 4:7
“Redemption” refers to a sale. This is the verse states, “It should not be redeemed” (Vayikra 27:27) when referring to a sale.
“Exchange” is a chalifin exchange, as the verse states, “He should not exchange it nor switch it.” “To uphold everything. A man would take off his shoe and would give it to his friend.”
We explore the notions of kinship and acquisition in the book of Ruth.