'Hearts' in the Bible

Then he said to them, Go away now, and take the fat for your food and the sweet for your drink, and send some to him for whom nothing is made ready: for this day is holy to our Lord: and let there be no grief in your hearts; for the joy of the Lord is your strong place.

And gave witness against them so that you might make them come back again to your law: but their hearts were lifted up, and they gave no attention to your orders and went against your decisions (which, if a man keeps them, will be life to him), and turning their backs on you, made their necks stiff and did not give ear.