3:16  

एवं प्रवर्तितं चक्रं नानुवर्तयतीह यः ।
अघायुरिन्द्रियारामो मोघं पार्थ स जीवति ॥३- १६॥

ewaM prawartitaM chakraM naanuwartayatiiha yaH ।

aghaayurindriyaaraamo moghaM paartha sa jiiwati ॥३- १६॥

Source: Automatic ITRANS Transliteration

This instituted cycle who does not follow,
Injuriously delighting in the perceptions, O son of Pritha, that one lives in vain.

One who does not follow this instituted cycle, who indulges at an injurious level in the perceptions, O son of Pritha, that one lives in vain.

Source: Milind S. Pandit

The one who does not help to keep the wheel of creation in motion by sacrificial duty, and who rejoices in sense pleasures, that sinful person lives in vain, O Arjuna.

Source: The Bhagavad-Gita: The Sacred Song

My dear Arjuna, a man who does not follow this prescribed Vedic system of sacrifice certainly leads a life of sin, for a person delighting only in the senses lives in vain.

Source: Bhagavad Gita As It Is