question #3 Sahih Muslim 718, Book 6, Hadith 92 : How does the fear of an act becoming obligatory influence the actions of a religious leader?

I have never seen the Messenger of Allah (ﷺ) observing the supererogatory prayer of the forenoon, but I observed it. And if the Messenger of Allah (ﷺ) abandoned any act which he in fact loved to do, it was out of fear that if the people practised it constantly, it might become obligatory for them.