question #2 Sahih Muslim 1214, Book 15, Hadith 150 : Why is it necessary to put on Ihram again when proceeding towards Mina during Hajj?

Jabir b. Abdullah reported that the Messenger of Allah (ﷺ) ordered us to put on Ihram (again) as we proceeded towards Mina after we had put it off (i. e. ‘on the 8th of Dhu’l-Hijja). So we pronounced Talbiya at al-Abtah.