Genesis 17:1 -- "Walk before me and be perfect."

In his commentary on Genesis, Allen P. Ross quotes Benno Jacob (First Book of the Bible, pp. 109-110) who has some excellent insights into "I am God Almighty; walk before me and be blameless."

If you want to become whole, which is my request for you, you must walk before me; you place yourself under my exclusive supervision, guidance, and protection. The image is taken from the shepherd who walks behind his herd directing it by his calls, or from the father under whose eyes the child walks. It is more than the walking "with" God of Enoch and Noah who were practically lead [sic] by the hand.

When questions arise you shall take directions only from God and be devoted to him without reservation. This word does not refer to moral conduct, for that would be too insignificant in this situation and is self-understood. The high demand corresponds to God's, "Be you mine, and I will be yours." (Creation and Blessing: A Guide to the Study and Exposition of Genesis, p.331)

Ross goes on writes that the Hebrew word "perfect" (tamin includes meanings of "without fault" and "complete" or "whole.") In other words, holiness and separateness is part of the meaning of the word.