'Purify' in the Bible

And the passover of the Jews was nigh, and many went up to Jerusalem out of the country before the passover, that they might purify themselves;

who did give himself for us, that he might ransom us from all lawlessness, and might purify to himself a peculiar people, zealous of good works;

how much more shall the blood of the Christ (who through the age-during Spirit did offer himself unblemished to God) purify your conscience from dead works to serve the living God?

draw nigh to God, and He will draw nigh to you; cleanse hands, ye sinners! and purify hearts, ye two-souled!

and every one who is having this hope on him, doth purify himself, even as he is pure.