Jamieson, Fausset & Brown

faithful in all his house--that is in all GOD'S house (Heb 3:4). servant--not here the Greek for "slave," but "a ministering attendant"; marking the high office of Moses towards God, though inferior to Christ, a kind of steward. for a testimony of, &c.--in order that he might in his typical institutions give "testimony" to Israel "of the things" of the Gospel "which were to be spoken afterwards" by Christ (Heb 8:5; Heb 9:8, Heb 9:23; Heb 10:1).