Mencius - Book 2, Part 2, Chapter 4

Mencius having gone to P'ing-lû, addressed the governor of it, saying, 'If one of your spearmen should lose his place in the ranks three times in one day, would you, Sir, put him to death or not?' 'I would not wait for three times to do so,' was the reply.

Mencius said, 'Well then, you, Sir, have likewise lost your place in the ranks many times. In bad calamitous years, and years of famine, the old and feeble of your people, who have been found lying in the ditches and water-channels, and the able-bodied, who have been scattered about to the four quarters, have amounted to several thousand.' The governor replied, 'That is a state of things in which it does not belong to me Chü-hsin to act.'

'Here,' said Mencius, 'is a man who receives charge of the cattle and sheep of another, and undertakes to feed them for him; of course he must search for pasture-ground and grass for them. If, after searching for those, he cannot find them, will he return his charge to the owner? or will he stand by and see them die?' 'Herein,' said the officer, 'I am guilty.'

Another day, Mencius had an audience of the king, and said to him, 'Of the governors of your Majesty's cities I am acquainted with five, but the only one of them who knows his faults is K'ung Chü-hsin.' He then repeated the conversation to the king, who said, 'In this matter, I am the guilty one.'
~ James Legge translation via nothingistic.org ~

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