Numbers 35:11
designate cities to serve as your cities of refuge, so that a person who kills someone unintentionally may flee there.
Berean Standard Bible
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Then ye shall appoint you cities to be cities of refuge for you; that the slayer may flee thither, which killeth any person at unawares.
then you shall appoint for yourselves cities to be cities of refuge for you, that the man slayer who kills any person unwittingly may flee there.