Numbers 35:21-23

Young's Literal Translation

²¹ or in enmity he hath smitten him with his hand, and he dieth; the smiter is certainly put to death; he [is] a murderer; the redeemer of blood doth put the murderer to death in his coming against him.

²² `And if, in an instant, without enmity, he hath thrust him through, or hath cast at him any instrument, without lying in wait;

²³ or with any stone wherewith he dieth, without seeing, and causeth [it] to fall upon him, and he dieth, and he [is] not his enemy, nor seeking his evil;