Open ye the gates - This is probably the language of a chorus responding to the sentiment in Isaiah 26:1. The captive people are returning; and this cry is made that the gates of the city may be thrown open, and that they may be permitted to enter without obstruction (compare Psalms 24:7, Psalms 24:9; Psalms 118:19).
That the righteous nation which keepeth the truth - Who, during their long captivity and contact with pagan nations, have not apostatized from the true religion, but have adhered firmly to the worship of the true God. This was doubtless true of the great body of the captive Jews in Babylon.