For there shall be a day - Literally, for this is the day, or the day is come. The watchmen - the prophets.
Arise ye, and let us go up to Zion - Let both Israelites and Jews join together in the worship of the Lord.
This verse anticipates a time when the schism caused by Jeroboam is over. Ephraimite watchmen equally with the tribe of Judah watch for the new moon that they may go up to Jerusalem to keep the appointed Feasts.