Moses
Deuteronomy 6:6ESV·traditional attribution

And these words that I command you today shall be on your heart.

John Calvin Reformed @genevareformer

6. And these words. In these four next verses God again commands (as before) the study of His Law. And first, indeed, He would have it implanted in their hearts, lest forgetfulness of it should ever steal over them; and by the word “heart” He designates the memory and other faculties of the mind; as though He had said that this was so great a...

Matthew Henry Presbyterian @wholebiblehenry

Here is, I. A brief summary of religion, containing the first principles of faith and obedience, Deu 6:4, Deu 6:5. These two verses the Jews reckon one of the choicest portions of scripture: they write it in their phylacteries, and think themselves not only obliged to say it at least twice every day, but very happy in being so obliged, having this saying among them...

Commenting on Deuteronomy 6:4-16

John Gill Reformed Baptist @doctorgill

And these words, which I command thee this day,.... To hearken to, observe, and take notice of, that God is one, and is to be loved in the strongest manner that possibly can be: shall be in thine heart; on the table of the heart, as the Targum of Jonathan; see Co2 3:3, be cordially received, have a place in the affections of the heart...