Matthew 22:36-37

"Teacher, which is the great commandment in the law?"

Hebrews 8:8-13

for, finding fault with them, He saith, "Behold, the days are coming, saith the Lord, when I will make a new covenant with the house of Israel, and the house of Judah;

Hebrews 12:24

and to Jesus, the Mediator of a new covenant, and to the blood of sprinkling, speaking better things than Abel.

Hebrews 13:20

Now the God of peace, Who brought up from the dead the Great Shepherd of the sheep, in virtue of the blood of an eternal covenant, even our Lord Jesus,

Treasury of Scripture Knowledge

Summary

And the king stood by a pillar, and made a covenant before the LORD, to walk after the LORD, and to keep his commandments and his testimonies and his statutes with all their heart and all their soul, to perform the words of this covenant that were written in this book. And all the people stood to the covenant.

With all their heart

Bible References

With all their heart

Matthew 22:36
"Teacher, which is the great commandment in the law?"