Confucius. Book 2, Chapter 7.
Book 2, Wei Chang
Tsze-yu asked what filial piety was. The Master said, "The filial piety of nowadays means the support of one's parents. But dogs and horses likewise are able to do something in the way of support; ‹ without reverence, what is there to distinguish the one support given from the other?"
Text source: Lun Yu, The Confucian Analects. Translated by James Legge.