For the source text click/tap here: Sotah 46
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"They told him all of Joseph's words that he had said to them, and he saw the wagons that Joseph had sent to carry him, and the spirit of their father Jacob was revived." (Gen. 45:27)
"all of Joseph’s words" - [Including] a sign he gave them: in what Torah topic he was engaged when he [Joseph] separated from him [from Jacob], the section dealing with the heifer that was to be beheaded [Egla Arufa--(Deut. 21:1-9)] and this is why [our verse] says, "and he saw the wagons that Joseph had sent," and not, "that Pharaoh had sent." (Ibid., Rashi based on Gen. Raba 94:3)
We explore the connection between the semantic pun of the wagons Jacob saw and the Parsha dealing with Eglah Arufah.