'With All Your Heart' in the Bible

And Samuel spoke to all the house of Israel, saying, "If with all your heart you [are] turning to Yahweh, remove the foreign gods and Ashtoreths from your midst. Commit your hearts to Yahweh and serve him alone. Then he will deliver you from the hand of [the] Philistines."

And Samuel said to the people, "Do not fear! You have done all this evil; only do not turn aside from {following} Yahweh. But you must serve Yahweh with all your heart.