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Where does the Bible say “blessed are the peacemakers”?

It is in Matthew 5:9 · King James Version

“Blessed are the peacemakers: for they shall be called the children of God.”
Read the chapter Matthew 5 →

See also

Romans 12:18

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

Hebrews 12:14

Follow peace with all men, and holiness, without which no man shall see the Lord: