Deuteronomy 19:3

Overview - Deuteronomy 19
The cities of refuge.
The privilege thereof for the manslayer.
14 The land-mark is not to be removed.
15 Two witnesses at the least are required.
16 The punishment of a false witness.
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Deuteronomy 19:3  (King James Version)
Thou shalt prepare thee a way, and divide the coasts of thy land, which the LORD thy God giveth thee to inherit, into three parts, that every slayer may flee thither.

Isaiah 35:8 ; 57:14 62:10 Hebrews 12:13