The Vedanta Sutras of Badarayana, Commentary by Sankara (SBE38), tr. by George Thibaut  at sacred-texts.com
16. (There is absolute) non-division (from Brahman, of the parts merged in it); according to scriptural declaration.
When the parts of him who knows are merged in Brahman, is there a remainder (which is not so merged), as in the case of other men; or is there no such remainder? As the merging of him also who knows falls under the general heading of merging, it might be assumed that of him also there remains a potential body, and the Sûtrakâra therefore teaches expressly that the elements, &c., of him who knows enter into the relation of (absolute) non-division from Brahman.--On what ground?--Because scripture declares this. For after having taught the dissolution of the parts, the text continues, 'Their name and form are broken, and people speak of the person only; and he becomes without parts and immortal' (Pr. Up. VI, 5). And when parts that are due to nescience are dissolved
through knowledge it is not possible that a remainder should be left. The parts therefore enter into absolute non-division from Brahman.