Hate the evil, and love the good, and establish justice in the gate: it may be that the LORD God of hosts will be gracious unto the remnant of Joseph.
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Cyril of Alexandria
AD 444
remnant of Joseph: Once again he refers to Ephraim, or the 10 tribes; as I said before, since Ephraim was a son of Joseph, he consequently refers to him also by his father’s name.
May be. God will not be wanting on his side. But this implies that man may find a difficulty in seeking good, and neglect to do it, though he may if he please, with God's assistance. (Worthington)
Remnant. Posterity. (Calmet)
and establish justice in the gate: It was the old custom that the elders should sit at the gate to make out by judicial trial the quarrels of persons at strife, in order that they should never enter the city at variance and should dwell there in harmony.