A covenant in his heart

Romans 11:27  For this is my covenant(1242) unto them, when I shall take away their sins. 

Hebrews 8:10  For this is the covenant(1242) that I will make with the house of Israel after those days, saith the Lord; I will put my laws into their mind, and write them in their hearts: and I will be to them a God, and they shall be to me a people: 

Psalms 40:8  I delight to do thy will, O my God: yea, thy law is within my heart.