Adam Clarke Bible Commentary

And the soul - נפש nephesh, of the child came into him again, על קרבו al kirbo, into the midst of him; and he revived, ויח vaiyechi, and he became alive. Did he not become alive from the circumstance of the immaterial principle coming again into him? Although רוח ruach is sometimes put for the breath, yet נפש generally means the immortal spirit, and where it seems to refer to animal life alone, it is only such a life as is the immediate and necessary effect of the presence of the immortal spirit. The words and mode of expression here appear to me a strong proof, not only of the existence of an immortal and immaterial spirit in man, but also that that spirit can and does exist in a separate state from the body. It is here represented as being in the midst of the child, like a spring in the center of a machine, which gives motion to every part, and without which the whole would stand still.