At the start of chapter 25 of Don Quixote by Miguel de Cervantes, Sancho Panza is not allowed to speak (to Don Quixote).
Don Quixote took leave of the goatherd, and once more mounting Rocinante bade Sancho follow him, which he having no ass, did very discontentedly. They proceeded slowly, making their way into the most rugged part of the mountain, Sancho all the while dying to have a talk with his master, and longing for him to begin, so that there should be no breach of the injunction laid upon him; but unable to keep silence so long he said to him:
"Senor Don Quixote, give me your worship's blessing and dismissal, for I'd like to go home at once to my wife and children with whom I can at any rate talk and converse as much as I like; for to want me to go through these solitudes day and night and not speak to you when I have a mind is burying me alive. If luck would have it that animals spoke as they did in the days of Guisopete, it would not be so bad, because I could talk to Rocinante about whatever came into my head, and so put up with my ill-fortune; but it is a hard case, and not to be borne with patience, to go seeking adventures all one's life and get nothing but kicks and blanketings, brickbats and punches, and with all this to have to sew up one's mouth without daring to say what is in one's heart, just as if one were dumb."
"I understand thee, Sancho," replied Don Quixote; "thou art dying to have the interdict I placed upon thy tongue removed; consider it removed, and say what thou wilt while we are wandering in these mountains."
When did this happen? I don't remember Don Quixote disallowing him to do so at all.