Riddle 43: Soul and Body

I know a noble guest cherished in his excellent dwelling, whom grim hunger cannot harm nor hot thirst, old age nor illness. If the servant tends him kindly, he who must ever go on the journey, they shall find in safety in their home food and gladness appointed for them, countless kindred; sorrow, if the servant obeys his lord badly, his master on the journey. Nor will one brother fear another; when, hasting away, they both leave the bosom of one kinswoman, mother and sister, they both suffer. Let the man who will, set forth in fitting words what the stranger is called or the servant of which I speak here.