1 Chronicles 28:9
And you, Solomon my son, know you the God of your father, and serve him with a perfect heart and with a willing mind: for the LORD searches all hearts, and understands all the imaginations of the thoughts: if you seek him, he will be found of you; but if you forsake him, he will cast you off for ever.
Torrey's Topical Textbook—AKJV

Jeremiah 17:10
I the LORD search the heart, I try the reins, even to give every man according to his ways, and according to the fruit of his doings.
Torrey's Topical Textbook—AKJV