1 Thessalonians 5:23-24

Now may the God of peace Himself sanctify you completely; and may your whole spirit, soul, and body be preserved blameless at the coming of our Lord Jesus Christ. 24 He who calls you is faithful, who also will do it.

Here Paul prays that God would make the Thessalonians completely holy (in every part of them), so that when Christ comes they would be found by Him to be preserved blameless. Positionally, in Christ, we can be confident that God will in fact complete His good work in us and that we will be found blameless at His coming (Phil. 1:6). But let us also, in a practical sense, pray that He would keep us from sin until He comes, so that He will be please with us.