'Perfect' in the Bible

All of them men of war, keeping rank in battle array, came with a perfect heart to Hebron, to make David king over all Israel; and all the rest also of Israel were of one heart to make David king.

And thou, Solomon my son, know the God of thy father, and serve him with a perfect heart and with a willing mind; for Jehovah searches all hearts, and discerns all the imaginations of the thoughts. If thou seek him, he will be found of thee; but if thou forsake him, he will cut thee off for ever.

And the people rejoiced because they offered willingly, for with perfect heart they offered willingly to Jehovah; and David the king also rejoiced with great joy.

And give to Solomon my son a perfect heart, to keep thy commandments, thy testimonies, and thy statutes, and to do all, and to build the palace, for which I have made provision.