Open ye the gates, that the righteous nation which keepeth the truth may enter in.
2. Open ye the gates. This “song” was undoubtedly despised by many, when it was published by Isaiah; for during his life, the inhabitants of Jerusalem were wicked and ungodly, and the number of good men was exceedingly small. But after his death, when they had been punished for their wickedness, it was in some measure perceived that this prediction had not been uttered in vain.
The Church is a strong city with salvation itself as its walls. God has appointed this defense; those destined for salvation find in it their true protection, far stronger than any rampart of stone. The righteous who keep the truth are the city's real inhabitants and strength.
AI summary
Commenting on Isaiah 26:1-4
Open ye the gates,.... Not of Jerusalem, literally understood, nor of heaven; rather of the New Jerusalem, whose gates are described, Rev 21:12 at least of the church in the latter day; the gates or door into which now should be, and then will be, open; Christ the door, and faith in him, and a profession of it, without which none ought to be admitted...