2 Corinthians 3:2-3
You are our epistle, written by our hearts, known and read by all men,
Hebrews 8:6-10
but now he has obtained a more excellent service, by as much also as he is the mediator of a better covenant, which is established on better promises.
Hebrews 10:16
This is the covenant which I will make with them after those days, the Lord says, I will put my laws in their hearts, and in their minds will I write them,
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