The Yogācārabhūmi-śāstra, Volume 34 (15)

How does one contemplate the nature of impermanence in the alterations of the bodily limbs? It is by observing that for oneself or others, previously the limbs were complete and undiminished, and later one observes the limbs diminished. This diminishment was caused by a king, or by a thief, or by a person, or by a non-human. After seeing this, one thinks thus: thus, all conditioned phenomena are impermanent in nature. The rest as previously mentioned.

How to observe the nature of impermanence in the alterations occurring in the bodily limbs? Seeing that one's own or others' limbs were previously complete and undiminished, and later one sees the limbs diminished. This matter was caused by a king's punishment, or by a thief's robbery, or by others, or by non-humans. After observing these phenomena, such a thought arises in the mind: thus, all conditioned phenomena are indeed impermanent in nature.