Mencius - Book 4, Part 2, Chapter 31A

When the philosopher Tsang dwelt in Wû-ch'ang, there came a band from Yüeh to plunder it. Someone said to him, 'The plunderers are coming: why not leave this?' Tsang on this left the city, saying to the man in charge of the house, 'Do not lodge any persons in my house, lest they break and injure the plants and trees.' When the plunderers withdrew, he sent word to him, saying, 'Repair the walls of my house. I am about to return.' When the plunderers retired, the philosopher Tsang returned accordingly.

His disciples said, 'Since our master was treated with so much sincerity and respect, for him to be the first to go away on the arrival of the plunderers, so as to be observed by the people, and then to return on their retiring, appears to us to be improper.' Ch'an-yû Hsing said, 'You do not understand this matter. Formerly, when Ch'an-yû was exposed to the outbreak of the grass-carriers, there were seventy disciples in our master's following, and none of them took part in the matter.'
~ James Legge translation via nothingistic.org ~

Go here to read the introductory post to this serialized version of the Works of Mencius.