Sahih Bukhari
Sahih Bukhari Volume 001, Book 003, Hadith Number 068.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 03. Knowledge
Narated By Ibn Mas'ud : The Prophet used to take care of us in preaching by selecting a suitable time, so that we might not get bored. (He abstained from pestering us with sermons and knowledge all the time).