From The Silver Chair by C.S. Lewis:
“If you’re thirsty, you may drink.”
For a second she stared here and there, wondering who had spoken. Then the voice said again, “If you are thirsty, come and drink,” and of course she remembered what Scrubb had said about animals talking in that other world, and realized that it was the lion speaking. Anyway, she had seen its lips move this time and the voice was not like a man’s. It was deeper, wilder, and stronger; a sort of heavy, golden voice. It did not make her any less frightened than she had been before, but it made her frightened in rather a different way.
“Are you not thirsty?” said the Lion. “I’m dying of thirst,” said Jill. “Then drink,” said the Lion. “May I -- could I-- would you mind going away while I do?” said Jill. The Lion answered this only by a look and a very low growl. And as Jill gazed at its motionless bulk, she realized that she might as well have asked the whole mountain to move aside for her convenience.
The delicious rippling noise of the stream was driving her nearly frantic. “Will you promise not to--do anything to me, if I do come?” said Jill. “I make no promise,” said the Lion. Jill was so thirsty now that, without noticing it, she had come a step nearer. “Do you eat girls?” she said. “I have swallowed up girls and boys, women and men, kings and emperors, cities and realms,” said the Lion. It didn’t say this as if it were boasting, nor as if it were sorry, nor as if it were angry. It just said it.
“I daren’t come and drink,” said Jill. “Then you will die of thirst,” said the Lion. “Oh dear!” said Jill, coming another step nearer. “I suppose I must go and look for another stream then.”
“There is no other stream,” said the Lion.
“It never occurred to Jill to disbelieve the Lion-- no one who had seen his stern face could do that--and her mind suddenly made itself up. It was the worst thing she had ever had to do, but she went forward to the stream, knelt down and began scooping up water in her hand. It was the coldest, most refreshing water she had ever tasted. You didn’t need to drink much of it, for it quenched your thirst at once. Before she tasted it she had been intending to make a dash away from the Lion the moment she had finished. Now, she realized that this would be on the whole the most dangerous thing of all.”