en_tn/neh/12/24.md

Hashabiah, Sherebiah ... Jeshua ... Kadmiel

These are names of men. (See: rc://en/ta/man/jit/translate-names)

who stood opposite them to give praise and to give thanks, responding section by section

This refers to how they sang some of their songs in worship. A leader or one group would sing a phrase, then one or two groups that "stood opposite them" would sing a phrase in response.

obedience to the command of David

King David had commanded the Levites how they were to organize and lead worship.