Bhagwad Gita
Chapter 3, Verse 16
एवं प्रवर्तितं चक्रं नानुवर्तयतीह यः।
अघायुरिन्द्रियारामो मोघं पार्थ स जीवति।।3.16।।
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.