1 Kings 8:61
“Let your heart therefore be perfect with the Lord our God, to walk in his statutes, and to keep his commandments, as at this day.”
And let these my words, wherewith I have made supplication before the Lord, be nigh unto the Lord our God day and night, that he maintain the cause of his servant, and the cause of his people Israel at all times, as the matter shall require:
That all the people of the earth may know that the Lord is God, and that there is none else.
Let your heart therefore be perfect with the Lord our God, to walk in his statutes, and to keep his commandments, as at this day.
And the king, and all Israel with him, offered sacrifice before the Lord.
And Solomon offered a sacrifice of peace offerings, which he offered unto the Lord, two and twenty thousand oxen, and an hundred and twenty thousand sheep. So the king and all the children of Israel dedicated the house of the Lord.
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Cross-References
“And thou, Solomon my son, know thou the God of thy father, and serve him with a perfect heart and with a willing mind: for the Lord searcheth all hearts, and understandeth all the imaginations of the thoughts: if thou seek him, he will be found of thee; but if thou forsake him, he will cast thee off for ever.”
“But the high places were not removed: nevertheless Asa’s heart was perfect with the Lord all his days.”
“I beseech thee, O Lord, remember now how I have walked before thee in truth and with a perfect heart, and have done that which is good in thy sight. And Hezekiah wept sore.”
“For it came to pass, when Solomon was old, that his wives turned away his heart after other gods: and his heart was not perfect with the Lord his God, as was the heart of David his father.”
“For it came to pass, when Solomon was old, that his wives turned away his heart after other gods: and his heart was not perfect with the Lord his God, as was the heart of David his father.”