'Soul' in the Bible

if they return to You with all their heart and with all their soul in the land of their captivity, and pray facing their land which You have given to their fathers and toward the city which You have chosen, and toward the house which I have built for Your Name;

They entered into a covenant (solemn agreement) to seek the Lord God of their fathers with all their heart and soul;

Then the king stood in his place and made a covenant before the Lord—to walk after (obey) the Lord, and to keep His commandments, His testimonies, and His statutes with all his heart and with all his soul, to perform the words of the covenant written in this book.