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Mercy belongs to the merciful and the merciful shall find mercy before the Throne of God.
Blessed are the merciful: for they shall obtain mercy. Matthew 5:7
The merciful man doeth good to his own soul: but he that is cruel troubleth his own flesh. Proverbs 11:17

Blessed are they who abound in acts of kindness toward others with hearts filled with warm hearted love.
For the Lord, Himself, shall do even the same unto them.
Sow to yourselves in righteousness, reap in mercy; break up your fallow ground: for it is time to seek the LORD, till he come and rain righteousness upon you. Hosea 10:12

Whatsoever we sow toward others is what God shall render back to us.
Be not deceived; God is not mocked: for whatsoever a man soweth, that shall he also reap. Galatians 6:7

He, who sows in bitterness and anger shall reap a bitter reward and shall face an angry God in judgment.
The fires of hell shall be his reward.
For he that soweth to his flesh shall of the flesh reap corruption; but he that soweth to the Spirit shall of the Spirit reap life everlasting. Galatians 6:8

Whatsoever we do toward others,  the Almighty God shall do towards us.
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 7:12

He who debases others shall be debased.
For they have sown the wind, and they shall reap the whirlwind: it hath no stalk: the bud shall yield no meal: if so be it yield, the strangers shall swallow it up. Hosea 8:7

He who uplifts others shall be uplifted.
And be ye kind one to another, tenderhearted, forgiving one another, even as God for Christ's sake hath forgiven you. Ephesians 4:32

Spend your whole life doing towards others what you would desire God to do to you.
Let your light so shine before men, that they may see your good works, and glorify your Father which is in heaven. Matthew 5:16