If one be found slain
 After public war with an enemy, Moses proceeds to speak of a private quarrel and fight of one man with another, in which one is slain, as Aben Ezra observes: 
 in the land which the Lord thy God giveth thee to possess it;
 where murders might be committed more secretly, and remain undiscovered, when they came to live in separate cities, towns, and villages, with fields adjacent to them, than now encamped together: 
 lying in the field;
 where the quarrel begun, and where the fight was fought: or, however, where the murderer met with his enemy, and slew him, and left him; it being common for duels to be fought, and murders committed in a field; the first murder in the world was committed in such a place, ( Genesis 4:8 ) . The Targum of Jonathan is, 
``not hidden under an heap, not hanging on a tree, nor swimming on the face of the waters;''which same things are observed in the Misnah F9, and gathered from some words in the text:
 in the land,
 and so not under a heap; 
 lying,
 and so not hanging; 
 in the field,
 and so not swimming on the water: 
 and it be not known who hath slain him;
 the parties being alone, and no witnesses of the fact, at least that appear; for, if it was known, the heifer was not beheaded, later mentioned F11; and one witness in this case was sufficient, and even one that was not otherwise admitted.