1 Corinthians 11:28
But let a man examine himself, and so let him eat of the bread and drink of the cup.
2 Corinthians 13:5
Examine yourselves as to whether you are in the faith. Test yourselves. Do you not know yourselves, that Jesus Christ is in you?—unless indeed you are disqualified.
But let each one examine his own work, and then he will have rejoicing in himself alone, and not in another.