Sahih al-Bukhari #70

`Abdullah used to give a religious talk to the people on every Thursday. Once a man said, "O Aba `Abdur-Rahman! (By Allah) I wish if you could preach us daily." He replied, "The only thing which prevents me from doing so, is that I hate to bore you, and no doubt I take care of you in preaching by selecting a suitable time just as the Prophet (ﷺ) used to do with us, for fear of making us bored