Deuteronomy 19:4

19:4 This is the case of the manslayer, that shall flee there and live: whoever kills his neighbor unawares, and didn't hate him in time past;
-World English Bible

Other Translation

19:4 And this [is] the case of the slayer, which shall flee thither, that he may live: Whoso killeth his neighbour ignorantly, whom he hated not in time past;
-King James Version