Deuteronomy 6:4-7a:

Hear, O Israel:
YHWH, our God, YHWH is One!
You are to love YHWH, your God,
with all your heart,
and with all your soul,
and with all your strength.
Let these words that I command you today
be written in your heart.
Teach them diligently to your children,
and repeat them constantly—