2 Peter 3:2

Again Peter put the teaching of the apostles, which these men received from Jesus Christ, on a level of authority equal with the writings of the Old Testament prophets (cf. 2 Peter 1:12-21; 2 Peter 3:16; Acts 1:16; Romans 9:29; Hebrews 4:7).

"The ’commandment’ is used here in the same way as in 2 Peter 2:21 . . .: it emphasizes the ethical aspect of the Christian message because it is on this, along with the eschatological expectation, that the author wishes to insist, in opposition to the false teachers." [Note: Bauckham, p. 288.]