Some say that this passage (below) has to do with the birth of the nation of Israel in 1948. But it seems to me, especially in light of the context here (Isaiah 66), that this is a reference to Israel’s rebirth—her salvation, which will come in a single day, on the day of Christ’s coming.
Isaiah 66:6-9 “A voice of uproar from the city, a voice from the temple, The voice of the Lord who is rendering recompense to His enemies. 7 “Before she travailed, she brought forth; Before her pain came, she gave birth to a boy. 8 “Who has heard such a thing? Who has seen such things? Can a land be born in one day? Can a nation be brought forth all at once? As soon as Zion travailed, she also brought forth her sons. 9 “Shall I bring to the point of birth, and not give delivery?” says the Lord. “Or shall I who gives delivery shut the womb?” says your God.
The birth pains, or labor pains, I think, is a reference to the tribulation, which Israel will go through just before Christ comes and Israel is saved. A good passage for this is in Jeremiah 30:6-7:
‘Ask now, and see, If a male can give birth. Why do I see every man With his hands on his loins, as a woman in childbirth? And why have all faces turned pale? 7 ‘Alas! for that day is great, There is none like it; And it is the time of Jacob’s distress, But he will be saved from it.
Yes, the whole nation of Israel will all at once be saved (what is left of them after the tribulation). Romans 11:26-27 tells us this.
Romans 11:26-27 And thus all Israel will be saved; just as it is written, “The Deliverer will come from Zion, He will remove ungodliness from Jacob.” 27 “And this is My covenant with them, When I take away their sins.”
This will be a day of great rejoicing. I can hardly wait for that day when God ushers them into His glorious kingdom. Isaiah 66:10-11 says…
“Rejoice with Jerusalem, And be glad with her, all you who love her; Rejoice for joy with her, all you who mourn for her; 11 That you may feed and be satisfied With the consolation of her bosom, That you may drink deeply and be delighted With the abundance of her glory.”