Deuteronomy 20:10
"When thou comest nigh unto a city to fight against it, then proclaim peace unto it."
Cross References (ranked by relevance)
And came and preached peace to you which were afar off, and to them that were nigh.
And I will cut off the chariot from Ephraim, and the horse from Jerusalem, and the battle bow shall be cut off: and he shall speak peace unto the heathen: and his dominion shall be from sea even to sea, and from the river even to the ends of the earth.
I create the fruit of the lips; Peace, peace to him that is far off, and to him that is near, saith the LORD; and I will heal him.
The word which God sent unto the children of Israel, preaching peace by Jesus Christ: (he is Lord of all:)