'Hearts' in the Bible

Judah and Israel were as great in number as the sand by the seaside, and they took their food and drink with joy in their hearts.

Said, O Lord, the God of Israel, there is no God like you in heaven or on the earth; keeping faith and mercy unchanging for your servants, while they go in your ways with all their hearts.

Give ear in heaven your living-place, acting in mercy; and give to every man whose secret heart is open to you, the reward of all his ways; for you, and you only, have knowledge of the hearts of all the children of men:

Turning our hearts to himself, guiding us to go in all his ways, to keep his orders and his laws and his decisions, which he gave to our fathers.

Then let your hearts be without sin before the Lord our God, walking in his laws and keeping his orders as at this day.

And on the eighth day he sent the people away, and, blessing the king, they went to their tents full of joy and glad in their hearts, because of all the good which the Lord had done to David his servant and to Israel his people.

Give me an answer, O Lord, give me an answer, so that this people may see that you are God, and that you have made their hearts come back again.