A rough valley — That such a desert and horrid place might beget an horror of murder and of the murderer. Strike off the neck — To shew what they would and should have done to the murderer if they had found him.
Related Commentaries of Deuteronomy 21:4
Deuteronomy 21:4
4 And the elders of that city shall bring down the heifer unto a rough valley, which is neither eared nor sown, and shall strike off the heifer's neck there in the valley: