'Blameless' in the Bible

“As for you, Solomon my son, know the God of your father [have personal knowledge of Him, be acquainted with, and understand Him; appreciate, heed, and cherish Him] and serve Him with a blameless heart and a willing mind; for the Lord searches all hearts and minds, and understands every intent and inclination of the thoughts. If you seek Him [inquiring for and of Him and requiring Him as your first and vital necessity] He will let you find Him; but if you abandon (turn away from) Him, He will reject you forever.

Then the people rejoiced because they had given willingly, for with a whole and blameless heart they had offered freely to the Lord. King David also rejoiced greatly.

and give to my son Solomon a perfect heart to keep Your commandments, Your testimonies, and Your statutes, and to do all [that is necessary] to build the temple [for You], for which I have made provision.”