Joshua 20:3

That the slayer that kills any person accidentally and unintentionally may flee there: and they shall be your refuge from the avenger of blood.

Treasury of Scripture Knowledge

Summary

That the slayer that killeth any person unawares and unwittingly may flee thither: and they shall be your refuge from the avenger of blood.

General references

Bible References

General references

Numbers 35:19
The avenger of blood himself shall slay the murderer: when he meets him, he shall slay him.