Deuteronomy 6:2-6 New Revised Standard Version Catholic Edition (NRSVCE)
2 so that you and your children and your children’s children may fear the Lord your God all the days of your life, and keep all his decrees and his commandments that I am commanding you, so that your days may be long. 3 Hear therefore, O Israel, and observe them diligently, so that it may go well with you, and so that you may multiply greatly in a land flowing with milk and honey, as the Lord, the God of your ancestors, has promised you.
4 Hear, O Israel: The Lord is our God, the Lord alone.[a] 5 You shall love the Lord your God with all your heart, and with all your soul, and with all your might. 6 Keep these words that I am commanding you today in your heart.