'Soul' in the Bible

if they return unto thee with all their heart and with all their soul in the land of their captivity, whither they have carried them captive, and pray toward their land, which thou gavest unto their fathers, and the city which thou hast chosen, and toward the house which I have built for thy name:

And they entered into the covenant to seek Jehovah, the God of their fathers, with all their heart and with all their soul;

And the king stood in his place, and made a covenant before Jehovah, to walk after Jehovah, and to keep his commandments, and his testimonies, and his statutes, with all his heart, and with all his soul, to perform the words of the covenant that were written in this book.