question #3 Sahih Muslim 761a, Book 6, Hadith 211 : What can be inferred about the Prophet Muhammad’s (ﷺ) approach to voluntary prayers becoming obligatory?

I saw what you were doing, but I desisted to come to you (and lead the prayer) for I feared that this prayer might become obligatory for you. (He the narrator) said: It was the month of Ramadan.