GOD'S WORD® Translation
Otherwise, in a rage the relative who has the authority to avenge the death will pursue him. If the place is too far away, the relative may catch up with him and take his life even though he didn't deserve the death penalty, because in the past he never hated the person he killed.

American Standard Version
lest the avenger of blood pursue the manslayer, while his heart is hot, and overtake him, because the way is long, and smite him mortally; whereas he was not worthy of death, inasmuch as he hated him not in time past.

Berean Study Bible
Otherwise, the avenger of blood might pursue the manslayer in a rage, overtake him if the distance is great, and strike him dead though he did not deserve to die, since he did not intend any harm.

Douay-Rheims Bible
Lest perhaps the next kinsman of him whose blood was shed, pushed on by his grief should pursue, and apprehend him. if the way be too long, and take away the life of him who is not guilty of death, because he is proved to have had no hatred before against him that was slain.

English Revised Version
lest the avenger of blood pursue the manslayer, while his heart is hot, and overtake him, because the way is long, and smite him mortally; whereas he was not worthy of death, inasmuch as he hated him not in time past.

King James Bible
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.

World English Bible
lest the avenger of blood pursue the manslayer, while his heart is hot, and overtake him, because the way is long, and strike him mortally; whereas he was not worthy of death, inasmuch as he didn't hate him in time past.

Young's Literal Translation
lest the redeemer of blood pursue after the man-slayer when his heart is hot, and hath overtaken him (because the way is great), and hath smitten him -- the life, and he hath no sentence of death, for he is not hating him heretofore;

Deuteronomy 19:6 Additional Translations ...