for he was yet in the loins of his father, when Melchizedek met him.

Because he was still in his father's body when Melchizedek came to him.

Διοτι εν τη οσφυι του πατρος αυτου ητο ετι, οτε συνηντησεν αυτον ο Μελχισεδεκ.

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