Contemplation on transience - The first Anuprekṣā (4) (contemplative meditation); repeated reflection or exercise (i.e., practice) of the contemplation that all the relations of the soul with the body, persons and material objects are impermanent.
bāhyābhijantarāṇi śarīraśayyā''sanavastrādīni dravyaṇi sarvasaṃyogāścānityā ityanucintayet.
(TaBhā 9.7)