'Certain' in the Bible

not that another one really exists. To be sure, there are certain people who are troubling you and want to distort the gospel about the Messiah.

I went up [to Jerusalem] because of a [divine] revelation, and I put before them the gospel which I preach among the Gentiles. But I did so in private before those of reputation, for fear that I might be running or had run [the course of my ministry] in vain.

For before that certain came from James, he did eat with the Gentiles: but when they were come, he withdrew and separated himself, fearing them which were of the circumcision.

Be certain, then, that those who are of faith, the same are sons of Abraham.

Brothers, as men would say, even a man's agreement, when it has been made certain, may not be put on one side, or have additions made to it.

I am certain about you in the Lord, that you will be of no other mind; but he who is troubling you will have his punishment, whoever he is.