question #3 Sahih Muslim 1188, Book 15, Hadith 33 : What is the importance of observing prayer in the mosque before starting the pilgrimage?

‘Abdullah b. ‘Umar (Allah be pleased with them) reported that the Messenger of Allah (ﷺ) spent the night at Dhu’l-Hulaifa while commencing (the rites of) Pilgrimage and he observed prayer in the mosque.