Matthew Poole and continuators on Hebrews 7:10

10 For he was yet in the loins of his father when Melchisedec met him .

For, introduceth the Proof, that Levi tithed in Abraham, being virtually in him, as his productive Cause; so near is the Unity and Identity of descending Children; and as truly were the Posterity of Adam in him when he ate, sinned, and fell, Rom. 5.12. To remove all question of the Truth of it, the time is annexed to it when Melchisedec met Abraham, and blessed him, then did Levi pay Tenths in him, so as Melchisedec was greater than the Levitical Priest; Christ typified by him being greater than himself, must be greater than them also.