Jeremiah 17:10 says, “I the Lord search the heart and examine the mind, to reward a man according to his conduct, according to what his deeds deserve.”
I the Lord; This is the Lord who spoke in Jeremiah 1:4, saying, “Before I formed you in the womb I new you, before you were born I set you apart; I appointed you as a prophet to the nations.”
In the OT, the God of Israel could be referred to by a number of names, titles and epithets. The names are indicators of developments reflecting concepts of the divine held by the ancient Israelites.
El (Divinity), El-Elyon (God Most High), El-Olam (Everlasting God), Shaddai (Almighty), Abir (Mighty One), Elohim (God), Adon/Adonai (Lord). And the divine name Yahweh.