question #1 Sahih Muslim 119b, Book 1, Hadith 222 : Who was Thabit b. Qais and what role did he play among the Ansar?

Thabit b. Qais was the orator of the Ansar, when this verse was revealed: the rest of the hadith is the same with the exception that there is no mention of Sa’d b. Mu’adh in it.