question #1 Sahih Muslim 85d, Book 1, Hadith 161 : What is the significance of the chain of narrators in the transmission of hadiths?

This hadith has been transmitted by Muhammad b. Bashshar, Muhammad b. Ja’far Shu’ba with this chain of narrators, with the addition that he pointed towards the house of ‘Abdullah, but he did not mention his name for us.