Sahih al-Bukhari 69
Sahih al-Bukhari · Book 3: Knowledge · The Prophet (saws) used to take care of the people in preaching by selecting a suitable time so that they might not run away (never made them averse or bored them with religious talk and knowledge all the time)
Narrated Anas bin Malik:
حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ ، قَالَ حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ ، قَالَ حَدَّثَنَا شُعْبَةُ ، قَالَ حَدَّثَنِي أَبُو التَّيَّاحِ ، عَنْ أَنَسٍ ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " يَسِّرُوا وَلاَ تُعَسِّرُوا، وَبَشِّرُوا وَلاَ تُنَفِّرُوا " .
The Prophet (ﷺ) said, "Facilitate things to people (concerning religious matters), and do not make it hard for them and give them good tidings and do not make them run away (from Islam).