1 Corinthians 11:28

and let a man be proving himself, and so of the bread let him eat, and of the cup let him drink;

2 Corinthians 13:5

Your own selves try ye, if ye are in the faith; your own selves prove ye; do ye not know your own selves, that Jesus Christ is in you, if ye be not in some respect disapproved of?

Galatians 6:4

and his own work let each one prove, and then in regard to himself alone the glorying he shall have, and not in regard to the other,

Psalm 26:2-7

Try me, O Jehovah, and prove me, Purified are my reins and my heart.

Lamentations 3:40

We search our ways, and investigate, And turn back unto Jehovah.

Numbers 9:10-13

'Speak unto the sons of Israel, saying, Though any man is unclean by a body or in a distant journey (of you or of your generations), yet he hath prepared a passover to Jehovah;

Haggai 1:5

And now, thus said Jehovah of Hosts, Set your heart to your ways.

Haggai 1:7

Thus said Jehovah of Hosts: Set your heart to your ways.

Zechariah 7:5-7

'Speak unto all the people of the land, and unto the priests, saying:

Matthew 5:23-24

'If, therefore, thou mayest bring thy gift to the altar, and there mayest remember that thy brother hath anything against thee,

1 Corinthians 11:31

for if ourselves we were discerning, we would not be being judged,

1 John 3:20-21

because if our heart may condemn -- because greater is God than our heart, and He doth know all things.

Treasury of Scripture Knowledge

Summary

But let a man examine himself, and so let him eat of that bread, and drink of that cup.

Bible References

Let a

1 Corinthians 11:31
for if ourselves we were discerning, we would not be being judged,
Psalm 26:2
Try me, O Jehovah, and prove me, Purified are my reins and my heart.
Lamentations 3:40
We search our ways, and investigate, And turn back unto Jehovah.
Haggai 1:5
And now, thus said Jehovah of Hosts, Set your heart to your ways.
Zechariah 7:5
'Speak unto all the people of the land, and unto the priests, saying:
2 Corinthians 13:5
Your own selves try ye, if ye are in the faith; your own selves prove ye; do ye not know your own selves, that Jesus Christ is in you, if ye be not in some respect disapproved of?
Galatians 6:4
and his own work let each one prove, and then in regard to himself alone the glorying he shall have, and not in regard to the other,
1 John 3:20
because if our heart may condemn -- because greater is God than our heart, and He doth know all things.

And so

Numbers 9:10
'Speak unto the sons of Israel, saying, Though any man is unclean by a body or in a distant journey (of you or of your generations), yet he hath prepared a passover to Jehovah;
Matthew 5:23
'If, therefore, thou mayest bring thy gift to the altar, and there mayest remember that thy brother hath anything against thee,

General references

Deuteronomy 4:5
See, I have taught you statutes and judgments, as Jehovah my God hath commanded me -- to do so, in the midst of the land whither ye are going in to possess it;
1 Corinthians 11:31
for if ourselves we were discerning, we would not be being judged,