Morning Star by H. Rider Haggard

In the morning, after Tua and Asti had put on the clean robes that lay to their hands, and eaten, suddenly they looked up and perceived that Kepher, the ancient beggar of the desert, was in the room with them, though neither of them had heard or seen him enter.

"You come silently, Friend," said Asti, looking at him with a curious eye. "A Double could not move with less noise, and -- where is your shadow? " she added, staring first at the sun without, and then at the floor upon which he stood.