Josh 20:3

20:3 without intent or unknowingly. Unintentional sin receives specific treatment in the law (Lev. 4:2, 13, 22, 27; 5:15, 18; Num. 15:22–29; 35:22; Deut. 4:42; 19:4; Ezek. 45:20; cf. Heb. 9:7).

avenger of blood. This would be the victim’s nearest male relative or possibly an official of the city where the killing occurred (Num. 35:19–21).