John Gill Commentary Genesis 25:28

"Now Isaac loved Esau, because he did eat of his venison. And Rebekah loved Jacob." — Genesis 25:28 (ASV)

And Isaac loved Esau, because he did eat of [his] venison ,
&c.] Better than Jacob, not only because he was his firstborn, but because he brought him of the flesh of creatures, which he took in hunting, and being dressed, were savoury food to him: it is in the original, "because venison (or what he hunted) [was] in his mouth" ^F8 , into which he put it, and was very grateful to his taste: but Rebekah loved Jacob ;
more than Esau, being more at home with her, and of a milder disposition; and more especially being a good man, a partaker of the grace of God, and to whom she knew by the oracle the blessing and promise belonged.

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FOOTNOTES:

• F8: (wypb dyu yk) "quia venatio in ore ejus", Pagninus, Montanus.