Heidelberg Catechism · 1563

Q4. What does God's law require of us?

Christ teaches us this in a summary in Matthew 22: You shall love the LORD your God with all your heart, and with all your soul, and with all your mind. This is the great and first commandment. And a second is like it, You shall love your neighbour as yourself. On these two commandments depend all the law and the prophets.
Answer · Heidelberg Catechism

Scripture proofs

  1. [1]
    Deuteronomy 6:5

    And thou shalt love the Lord thy God with all thine heart, and with all thy soul, and with all thy might.

  2. [2]
    Leviticus 19:18

    Thou shalt not avenge, nor bear any grudge against the children of thy people, but thou shalt love thy neighbour as thyself: I am the Lord.

Proof texts as given in the original; verse text from the King James Version.