The Vedanta Sutras of Badarayana, Commentary by Sankara (SBE38), tr. by George Thibaut [1896] at sacred-texts.com

49. And on account of the non-extension (of the individual soul), there is no confusion (of the results of actions).

Well, let it be granted that injunctions and prohibitions, are valid, because the Self although one is joined with particular bodies.--From the admission, however, of the unity of the Self it follows that there must be a confusion of the fruits of actions, there being only one master (i.e. one soul to enjoy the fruits of action).--This is not so, we reply, because there is no extension of the acting and enjoying Self, i.e. no connexion on its part with all bodies. For, as we have shown, the individual soul depends on its adjuncts, and owing to the non-extension of those adjuncts there is also non-extension of the soul. Hence there is no confusion of actions or fruits of actions.