Deuteronomy 21:1

21:1 If one be found slain in the land which Yahweh your God gives you to possess it, lying in the field, and it isn't known who has struck him;
-World English Bible

Other Translation

21:1 If [one] be found slain in the land which the LORD thy God giveth thee to possess it, lying in the field, [and] it be not known who hath slain him:
-King James Version