Heidelberg Catechism · 1563

Q107. Is it enough, then, that we do not kill our neighbour in any such way?

No. When God condemns envy, hatred, and anger, He commands us to love our neighbour as ourselves, to show patience, peace, gentleness, mercy, and friendliness toward him, to protect him from harm as much as we can, and to do good even to our enemies.
Answer · Heidelberg Catechism

Scripture proofs

  1. [1]
    Matthew 7:12

    Therefore all things whatsoever ye would that men should do to you, do ye even so to them: for this is the law and the prophets.

    Matthew 22:39

    And the second is like unto it, Thou shalt love thy neighbour as thyself.

    Romans 12:10

    Be kindly affectioned one to another with brotherly love; in honour preferring one another;

  2. [2]
    Matthew 5:5

    Blessed are the meek: for they shall inherit the earth.

    Luke 6:36

    Be ye therefore merciful, as your Father also is merciful.

    Romans 12:10

    Be kindly affectioned one to another with brotherly love; in honour preferring one another;

    Romans 12:18

    If it be possible, as much as lieth in you, live peaceably with all men.

    Galatians 6:1-2

    Brethren, if a man be overtaken in a fault, ye which are spiritual, restore such an one in the spirit of meekness; considering thyself, lest thou also be tempted. Bear ye one another’s burdens, and so fulfil the law of Christ.

    Ephesians 4:2

    With all lowliness and meekness, with longsuffering, forbearing one another in love;

    Colossians 3:12

    Put on therefore, as the elect of God, holy and beloved, bowels of mercies, kindness, humbleness of mind, meekness, longsuffering;

    1 Peter 3:8

    Finally, be ye all of one mind, having compassion one of another, love as brethren, be pitiful, be courteous:

  3. [3]
    Exodus 23:4-5

    If thou meet thine enemy’s ox or his ass going astray, thou shalt surely bring it back to him again. If thou see the ass of him that hateth thee lying under his burden, and wouldest forbear to help him, thou shalt surely help with him.

    Matthew 5:44-45

    But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you; That ye may be the children of your Father which is in heaven: for he maketh his sun to rise on the evil and on the good, and sendeth rain on the just and on the unjust.

    Romans 12:20

    Therefore if thine enemy hunger, feed him; if he thirst, give him drink: for in so doing thou shalt heap coals of fire on his head.

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