Deuteronomy 6:6

¹⁶Let the word of Christ dwell in you richly; in all wisdom teaching and admonishing one another with psalms, hymns, and spiritual songs, singing with grace in your heart to the Lord.

³Bind them on your fingers. Write them on the tablet of your heart.

³³“But this is the covenant that I will make with the house of Israel after those days,” says the LORD: “I will put my law in their inward parts, and I will write it in their heart. I will be their God, and they shall be my people.

¹⁸Therefore you shall lay up these words of mine in your heart and in your soul. You shall bind them for a sign on your hand, and they shall be for frontlets between your eyes.

³being revealed that you are a letter of Christ, served by us, written not with ink, but with the Spirit of the living God; not in tablets of stone, but in tablets that are hearts of flesh.

³¹The law of his God is in his heart. None of his steps shall slide.

⁴⁶He said to them, “Set your heart to all the words which I testify to you today, which you shall command your children to observe to do, all the words of this law.

¹¹I have hidden your word in my heart, that I might not sin against you.

⁷“Listen to me, you who know righteousness, the people in whose heart is my law. Don’t fear the reproach of men, and don’t be dismayed at their insults.

¹⁵Those in the good ground, these are those who with an honest and good heart, having heard the word, hold it tightly, and produce fruit with perseverance.