This continues the quotation from the prophet Jeremiah.
# They will not teach each one his neighbor and each one his brother, saying, 'Know the Lord.'
This direct quotation can be stated as an indirect quotation. AT: "They will not need to teach their neighbors or brothers to know me" (See: [[rc://en/ta/man/translate/figs-quotations]])
# neighbor ... brother
Both of these refer to fellow Israelites. (See: [[rc://en/ta/man/translate/figs-doublet]])