What is the origin of the idiom "body and soul" and when to use it?

The idiom "body and soul" is a figurative expression that reflects the fundamental components of a person. It has been used in English for centuries to describe the entirety of a person, encompassing both the physical (body) and the spiritual or emotional (soul) aspects. This expression is rooted in the concept that humans consist of both their physical and metaphysical selves. People use this phrase to describe a deep, wholehearted commitment or involvement in something, often suggesting that one is fully engaged or devoted with their entire being.