And thou shalt love the LORD thy God with all thine heart, and with all thy soul, and with all thy might.
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Deuteronomy 6:3-7
Tyndale Open Study Notes (CC BY-SA 4.0).
6:5 love the Lord: See study note on Josh 23:11. • The words heart, . . . soul, and . . . strength represent the intellect, the will, the emotions, the spirituality, and the physical being—all that a person is and can do for God. This commandment is the core of God’s covenant with Israel (see Jesus’ comments in Matt 22:37; Mark 12:30; Luke 10:27).
Other Bible passages linked to this one, most cited first.
And thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind, and with all thy strength: this is the first commandment.
Jesus said unto him, Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind.
And he answering said, Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy strength, and with all thy mind; and thy neighbour as thyself.
And now, Israel, what doth the LORD thy God require of thee, but to fear the LORD thy God, to walk in all his ways, and to love him, and to serve the LORD thy God with all thy heart and with all thy soul,
And the LORD thy God will circumcise thine heart, and the heart of thy seed, to love the LORD thy God with all thine heart, and with all thy soul, that thou mayest live.
But if from thence thou shalt seek the LORD thy God, thou shalt find him, if thou seek him with all thy heart and with all thy soul.
Authorship: the book itself or Christian tradition. Approximate dates, as in Carson and Moo, An Introduction to the New Testament, and Longman and Dillard, An Introduction to the Old Testament.