Thitherward; rather, hitherward: The prophet is evidently writing from Jerusalem (comp. Jeremiah 51:50). Let us join ourselves. A conjectural emendation (nilveh for nilvu, a difficult reading, meaning, perhaps, "join yourselves").
A perpetual covenant. The same phrase occurs in Jeremiah 32:40. The addition, "that shall not be forgotten," reminds us of "the ark of the covenant," which was "not to be remembered" (Jeremiah 3:16).