Śvetadvīpa-varṇana and Śāstra-pravartana (Śānti Parva 322)
उपतिष्ठति तिष्ठन्तं गच्छन्तमनुगच्छति । करोति कुर्वत: कर्म च्छायेवानुविधीयते
upatiṣṭhati tiṣṭhantaṃ gacchantam anugacchati | karoti kurvataḥ karma chāyevānuvidhīyate ||
毗湿摩说:业如影随人。人立则业近立,人行则业随行,人往则业同往。作者所作之事,其事本身连同其道德果报,步步相随,终不放舍。
भीष्म उवाच
A person cannot escape the consequences of their actions: karma adheres to the doer as closely as a shadow, accompanying them in every state—standing, moving, or acting—until it bears fruit.
In the Shanti Parva’s instruction on dharma, Bhishma delivers a moral maxim to Yudhiṣṭhira: he illustrates, through the image of a shadow, how deeds and their results inevitably follow the agent.