James 2:10

For anyone who obeys the whole of the Law but makes one single slip is guilty of breaking it all.

Galatians 3:10

For there is a curse upon all who rely on obedience to the Law, for the Scripture says, "Cursed be anyone who does not stand by everything that is written in the Book of the Law and obey it."

Matthew 5:18-19

For I tell you, as long as heaven and earth endure, not one dotting of an i or crossing of a t will be dropped from the Law until it is all observed.

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, as long as heaven and earth endure, not one dotting of an i or crossing of a t will be dropped from the Law until it is all observed.
Galatians 3:10
For there is a curse upon all who rely on obedience to the Law, for the Scripture says, "Cursed be anyone who does not stand by everything that is written in the Book of the Law and obey it."