'Heart' in the Bible

My heart is with the leaders of Israel,with the volunteers of the people.Praise the Lord!

The princes of Issachar were with Deborah;Issachar was with Barak.They set out at his heels in the valley.There was great searching of heartamong the clans of Reuben.

Why did you sit among the sheepfoldslistening to the playing of pipes for the flocks?There was great searching of heartamong the clans of Reuben.

“How can you say, ‘I love you,’” she told him, “when your heart is not with me? This is the third time you have mocked me and not told me what makes your strength so great!”