'Keep' in the Bible

As for you and your faith, keep your faith to yourself in the presence of God. The man is to be congratulated who does not pronounce judgement on himself in what his actions sanction.

But I beseech you, brethren, to keep a watch on those who are causing the divisions among you, and are leading others into sin, in defiance of the instruction which you have received; and habitually to shun them.