'Heart' in the Bible

and oppress not the widow, nor the fatherless, the sojourner, nor the poor; and let none of you devise evil against his brother in your heart.

And they of Ephraim shall be like a mighty man, and their heart shall rejoice as through wine; yea, their children shall see it, and rejoice; their heart shall be glad in Jehovah.

And the chieftains of Judah shall say in their heart, The inhabitants of Jerusalem are my strength in Jehovah of hosts their God.