Sahih Bukhari
Asking Permission
Volume: 008 / Book Number: 074 / Hadith Number: 291
Narrated Bishr:
as above (No. 290) adding: The Prophet was reclining (leaning) and then he sat up saying, "And I warn you against giving a false statement." And he kept on saying that warning so much so that we said, "Would that he had stopped."