"And unto them that look for Him shall He appear the second time without sin unto salvation." This needs to be interpreted in harmony with its context, and as furnishing the antitype of what is found in Leviticus 16. The word for "appear" here is not the one commonly used for the return of Christ—it means "to be seen." When Aaron disappeared within the veil, the people waited with eager expectation until he came out again to bless them. So Christ, having made atonement, and gone into heaven, shall yet re-appear and be seen by those who wait for Him. As men after death, must yet appear the "second time" in their body, to undergo condemnation therein; so Christ shall appear the second time, to bestow on God’s elect eternal salvation.
"Unto them that look for Him:" that is, all the redeemed, the "many" whose sins He bore. Though the vision tarry, they wait for it (Hab. 2:3). Five things are included in this word "look for." First, the steadfast faith of His appearing, resting with implicit confidence on His promise in John 14:2, 3. Second, a real love unto it: 2 Timothy 4:8. Third, an ardent longing after it, so that they cry, "Even so, come, Lord Jesus" (Rev. 22:20). Fourth, a patient waiting for it, in the midst of many discouragements: James 5:7, 8. Fifth, a personal preparation for it: Matthew 25:10, Luke 12:35-37.
"Without (imputed) sin, unto salvation." Hereby Christ’s second advent is contrasted from His first. When he appeared the first time, it was with "sin" upon Him (John 1:29) as the Surety of sinners. Therefore was He the Man of sorrows, and afflicted from His youth up (Ps. 88:15). But He will re-appear in a very different state: as the Conqueror of sin and Satan, the Savior of His people, the King of kings and Lord of lords. At His return, the efficacy of His once-for-all offering will be openly manifested. The question of His peoples’ sins having been finally settled at the cross, He will then glorify His redeemed. "For our conversation is in heaven: from whence also we look for the Savior, the Lord Jesus Christ: Who shall change our vile ,body, that it may be fashioned like unto His glorious body, according to the working whereby He is able even to subdue all things unto Himself" (Phil. 3:20, 21).