Romans 16:10

Origen supposeth this Apelles to be Apollos, of whom you read, Acts 18:24, and in other places. Epiphanius saith, he was teacher in the churches of Smyrna, before Polycarpus. Approved in Christ; one who hath showed himself a faithful and sincere Christian, who hath given many proofs of his sincerity, zeal, and constancy. This is a high encomium; to be in Christ is much, to be approved in Christ is more: tried gold is most precious. In a time of trial, to stand fast, and hold his own, is a Christian's greatest praise. Salute them which are of Aristobulus household; the word household is not in the Greek, but is added to fill up the sense; you have the like in the next verse, and in 1 Corinthians 1:11. Aristobulus himself is not saluted; either he was dead, or as yet unconverted to the faith of Christ; but it seems there were several Christians in or belonging to his family, whom the apostle here salutes. See the next verse.