'Pure' in the Bible

But it is from Him that you are in Christ Jesus, who became to us wisdom from God [revealing His plan of salvation], and righteousness [making us acceptable to God], and sanctification [making us holy and setting us apart for God], and redemption [providing our ransom from the penalty for sin],

For the unbelieving husband is sanctified [that is, he receives the blessings granted] through his [Christian] wife, and the unbelieving wife is sanctified through her believing husband. Otherwise your children would be [ceremonially] unclean, but as it is they are holy.