'Soul' in the Bible

if they return to you with all of their heart and with all of their soul in the land where they have been taken captive, as they pray in the direction of their land that you have given to their ancestors and to the city that you have chosen, and to the Temple that I have built for your name,

They also entered into a covenant to seek the LORD God of their ancestors with all their heart and soul,

While standing in his appointed place, the king made a public covenant with the LORD to follow the LORD, to keep his commandments, his testimonies, and his statutes, and to do so with all of his heart and soul, and to carry out what was written in the covenant contained in the book.