James 2:10

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

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 5:18-19

For I tell you assuredly, that till heaven and earth pass away, not one iota, or the smallest stroke of a letter, shall pass from the law, until all things shall be accomplished.

Treasury of Scripture Knowledge

Summary

For whosoever shall keep the whole law, and yet offend in one point, he is guilty of all.

Bible References

Whosoever

Matthew 5:18
For I tell you assuredly, that till heaven and earth pass away, not one iota, or the smallest stroke of a letter, shall pass from the law, until all things shall be accomplished.
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."