Adam Clarke on Psalms 69:35

God will save Zion - This fixes the Psalm to the time of the captivity. There was no Zion belonging to the Jews in the time of Saul, when those suppose the Psalm to be written who make David the author; for David after he came to the throne, won the stronghold of Zion from the Jebusites. 2Sam 5:7; 1Chr 11:5.

Will build the cities of Judah - This refers to the return from the captivity, when all the destroyed cities should be rebuilt, and the Jews repossess their forfeited heritages. Some apply this to the redemption of the human race; and suppose that Zion is the type of the Christian Church into which the Gentiles were to be called. What evangelists and apostles apply to our Lord, we safely may. What others see so clearly in this Psalm relative to Gospel matters, I cannot discern.