Sahih Al Bukhari – Book of Knowledge
Volumn 001, Book 003, Hadith Number 068.
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Narated By Ibn Mas’ud Razi Allah Anhu: The Prophet Peace Be Upon Him 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).
Junaid Tahir