Albert Barnes Commentary Acts 13:39

"and by him every one that believeth is justified from all things, from which ye could not be justified by the law of Moses." — Acts 13:39 (ASV)

And by him. By means of him; by his sufferings and death.

All that believe. .

Are justified. Are regarded and treated as if they were righteous. They are pardoned, and admitted to the favor of God, and treated as pardoned sinners, and as if they had not offended. See this point explained in Romans 1:17; Romans 3:24–25; and Romans 4:1 and 4:2-8.

From all things. From the guilt of all offenses. All will be pardoned.

From which you could not, etc. The law of Moses commanded what was to be done. It appointed sacrifices and offerings, as typical of a greater Sacrifice.

But the same apostle has fully shown, in the Epistle to the Hebrews, that those sacrifices could not take away sin (Hebrews 9:7–14; Hebrews 10:1–4, 11). The design of the law was not to reveal a way of pardon. That was reserved to be the peculiar purpose of the gospel.

The law of Moses. The commands and institutions which he, under the direction of God, established.