Charles Spurgeon Commentary Zechariah 8:1-2

"And the word of Jehovah of hosts came [to me], saying, Thus saith Jehovah of hosts: I am jealous for Zion with great jealousy, and I am jealous for her with great wrath." — Zechariah 8:1-2 (ASV)

Because they worshipped idols instead of the living God, Jehovah of hosts, who is a jealous God, was very angry with his ancient people and allowed them to be carried away into captivity; and it is well for us, in these days, to remember that we serve a jealous God, and that, if our hearts are not true to him, he will soon send us sharp afflictions and make us feel the weight of his rod. It was Paul's anxious desire that he might be able to present the church at Corinth as a chaste virgin to Christ; and, certainly, our Lord Jesus Christ will not accept the professing church of these days on any other terms.

Let your heart be loyal and true to him, or else you will stir up the holy jealousy of your God. Yet the same jealousy which makes God punish his people for their unfaithfulness, prompts him to return to them in love as soon as he sees that he can justly do so. When their enemies have sorely vexed and oppressed them, then is the Lord jealous, not against them, but against their enemies, and he swiftly returns to his own people in love.