Numbers 35:21

or if he hits him in hostility with his hand, and he dies, the one that struck him will put to death the killer when meeting him.

Treasury of Scripture Knowledge

Summary

Or in enmity smite him with his hand, that he die: he that smote him shall surely be put to death; for he is a murderer: the revenger of blood shall slay the murderer, when he meeteth him.

General references

Bible References

General references

Numbers 35:19
The blood avenger himself will put the killer to death; he must put him to death when meeting him.