Deuteronomy 19:6

Lest the avenger of the blood pursue the slayer, while his heart is hot, and overtake him, because the way is long, and slay him; whereas he {was} not worthy of death, inasmuch as he hated him not in time past. {slay...: Heb. smite him in life} {in...: Heb. from yesterday the third day}