question #3 Sahih Muslim 1128, Book 13, Hadith 158 : What changes occurred in the Prophet’s emphasis on fasting Ashura after Ramadan fasting became obligatory?

Jabir b Samura reported that the Messenger of Allah (ﷺ) commanded us to observe fast on the day of Ashura and exhorted us to do it and was particular about it But when (fasting) in Ramadan was made obligatory, he hence. forth neither commanded us nor forbade us, nor was he so particular about it.