Jeremiah 30:3 For, lo, the days come, saith the Lord, that I will bring again the captivity of my people Israel and Judah, saith the Lord: and I will cause them to return to the land that I gave to their fathers, and they shall possess it.
You might think this was fulfilled when they returned from captivity in Babylon.
4 And these are the words that the Lord spake concerning Israel and concerning Judah. 5 For thus saith the Lord; We have heard a voice of trembling, of fear, and not of peace. 6 Ask ye now, and see whether a man doth travail with child? wherefore do I see every man with his hands on his loins, as a woman in travail, and all faces are turned into paleness?
You might think this was fulfilled as well? This can't refer to 70 AD because He is likening it to giving birth, not to being exiled.
7 Alas! for that day is great, so that none is like it: it is even the time of Jacob's trouble, but he shall be saved out of it.
Israel was not saved out of 70 AD, they were sent to the four corners of the earth in a two thousand year time out.
8 For it shall come to pass in that day, saith the Lord of hosts, that I will break his yoke from off thy neck, and will burst thy bonds, and strangers shall no more serve themselves of him:
Once again, this cannot refer to the time of Jesus because they were under the yoke of the Romans. For the last two thousand years they have been serving strangers.
9 But they shall serve the Lord their God, and David their king, whom I will raise up unto them.
This can't refer to David who was already dead but rather to Jesus Christ, the greater David. So then, this has not yet been fulfilled for the Jews.
We serve a glorious God who can do all these things and tell us the end from the beginning.