Mencius. Book 2, Part 2, Chapter 14.
Book 2, Kung-Sun Ch'ow. Part 2.
1. When Mencius left Ts'e, he dwelt in Hew. There Kung-sun Ch'ow asked him, saying, "Was it the way of the ancient to hold office without receiving salary?"
2. Mencius replied, "No; when I first saw the king in Ts'ung, it was my intention, on retiring from the interview, to go away. Because I did not wish to change this intention, I declined to receive any salary.
3. "Immediately after, came orders for the collection of troops, when it would have been improper for me to beg permission to leave. But to remain so long in Ts'e was not my purpose."
Text source: The Works of Mencius. Translated by James Legge.