For he was still in the loins of his father, when Melchizedek met him
Other versions
King James Version
For he was yet in the loins of his father, when Melchisedec met him.English Standard Version
for he was still in the loins of his ancestor when Melchizedek met him.New International Version
because when Melchizedek met Abraham, Levi was still in the body of his ancestor.