The Idiot Part 2 Chapter 6 Page 5

It was a fact that Lebedeff, though he was so anxious to keep everyone else from disturbing the patient, was continually in and out of the prince’s room himself. He invariably began by opening the door a crack and peering in to see if the prince was there, or if he had escaped; then he would creep softly up to the arm-chair, sometimes making Muishkin jump by his sudden appearance.

He always asked if the patient wanted anything, and when the latter replied that he only wanted to be left in peace, he would turn away obediently and make for the door on tip-toe, with deprecatory gestures to imply that he had only just looked in, that he would not speak a word, and would go away and not intrude again; which did not prevent him from reappearing in ten minutes or a quarter of an hour.