Matthew 5:7

⁵ Blessed are the meek: for they shall inherit the earth.

⁶ Blessed are they which do hunger and thirst after righteousness: for they shall be filled.

Blessed are the merciful: for they shall obtain mercy.

⁸ Blessed are the pure in heart: for they shall see God.

⁹ Blessed are the peacemakers: for they shall be called the children of God.

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

Ephesians 4:32–5:1
And be ye kind one to another, tenderhearted, forgiving one another, even as God for Christ’s sake hath forgiven you.
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Matthew 6:14–15
For if ye forgive men their trespasses, your heavenly Father will also forgive you:
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2 Samuel 22:26
With the merciful thou wilt shew thyself merciful, and with the upright man thou wilt shew thyself upright.
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Matthew 18:33–35
Shouldest not thou also have had compassion on thy fellowservant, even as I had pity on thee?
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Psalms 18:25
With the merciful thou wilt shew thyself merciful; with an upright man thou wilt shew thyself upright;
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James 2:13
For he shall have judgment without mercy, that hath shewed no mercy; and mercy rejoiceth against judgment.
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James 3:17
But the wisdom that is from above is first pure, then peaceable, gentle, and easy to be intreated, full of mercy and good fruits, without partiality, and without hypocrisy.
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Colossians 3:12
Put on therefore, as the elect of God, holy and beloved, bowels of mercies, kindness, humbleness of mind, meekness, longsuffering;
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