Galatians 5:3

And again, I testify to every man who is circumcised, that he is under an obligation to keep the whole law.

Luke 16:28

for I have five brothers: that he may testify to them, that they also come not into this place of torment.

Galatians 3:10

For as many as are of the works of the law, are under a curse: for it is written, "Cursed is every one who continueth not in all the things written in the book of the law to do them."

Matthew 23:16

Wo unto you ye blind guides! who say, Whosoever shall swear by the temple, it is nothing; but whosoever shall swear by the gold of the temple, it is binding.

Matthew 23:18

And again, Whosoever shall swear by the altar, it is nothing; but whosoever shall swear by the gift that is upon it, it is binding.

Acts 2:40

And with many other words he testified and exhorted, saying, Be saved from this untoward generation.

Acts 20:21

repeatedly urging both on Jews and Greeks repentance towards God, and faith towards our Lord Jesus Christ.

Romans 2:25

For circumcision indeed is advantageous, if thou practise the law: but if thou art a transgressor of the law, thy circumcision becomes uncircumcision,

Ephesians 4:17

This then I urge and testify in the Lord, that ye walk no more as the other Gentiles walk in the vanity of their mind,

1 Thessalonians 4:6

that no man transgress against, or act dishonestly to his brother in this matter because the Lord is the avenger of all such things, as we have told you before, and testified.

James 2:10-11

For whosoever shall keep the whole law, but offendeth in a single particular, he is chargeable with the breach of all.

1 John 4:14

And we have seen and bear testimony, that the Father sent the Son to be the Saviour of the world.

Treasury of Scripture Knowledge

Summary

For I testify again to every man that is circumcised, that he is a debtor to do the whole law.

Bible References

Testify

Luke 16:28
for I have five brothers: that he may testify to them, that they also come not into this place of torment.
Acts 2:40
And with many other words he testified and exhorted, saying, Be saved from this untoward generation.
Acts 20:21
repeatedly urging both on Jews and Greeks repentance towards God, and faith towards our Lord Jesus Christ.
Ephesians 4:17
This then I urge and testify in the Lord, that ye walk no more as the other Gentiles walk in the vanity of their mind,
1 Thessalonians 4:6
that no man transgress against, or act dishonestly to his brother in this matter because the Lord is the avenger of all such things, as we have told you before, and testified.
1 John 4:14
And we have seen and bear testimony, that the Father sent the Son to be the Saviour of the world.

A debtor

Galatians 3:10
For as many as are of the works of the law, are under a curse: for it is written, "Cursed is every one who continueth not in all the things written in the book of the law to do them."
Matthew 23:16
Wo unto you ye blind guides! who say, Whosoever shall swear by the temple, it is nothing; but whosoever shall swear by the gold of the temple, it is binding.

General references

Luke 5:38
But new wine should be put into new bottles; then both are preserved.
Galatians 2:3
And even Titus, who was with me, though a Greek, was not compelled to be circumcised:
Philippians 3:7
But what things were gain to me, these have I counted loss for Christ.