Confucius. Book 1, Chapter 9.
Book 1, Hsio R.
The philosopher Tsang said, "Let there be a careful attention to perform the funeral rites to parents, and let them be followed when long gone with the ceremonies of sacrifice; ‹ then the virtue of the people wil resume its proper excellence."
Text source: Lun Yu, The Confucian Analects. Translated by James Legge.