LXX Num 35:21

ἢ διὰ ἐν αὐτὸν τῇ χειρί, καὶ ἀποθάνῃ, θανάτω θανατούσθω ὁ πατάξας, φονευτής ἐστιν· θανάτῳ θανατούσθω ὁ φονεύων· ὁ ἄγχι. στεύων τὸ αἷμα ἀποκτενεῖ τὸν φονεύσαντα ἐν τῷ συναντῆσαι αὐτῶ.

or if in hostility he strikes him with his hand and he dies, the one who struck him must surely be put to death; he is a murderer. When the avenger of blood finds the murderer, he is to kill him.