Why don't you spell it out for me.
What in the context of Acts 2:38-39 limits the promise of the verses to those who saw Jesus' miracles?
The crowd themselves. They were THERE. You weren't there. Nor was I.
Here is something in the context that says otherwise.
Act 2:38, Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost.
Act 2:39, For the promise is unto you, and to your children, and to all that are afar off, even as many as the Lord our God shall call.
I'm sure the children from this crowd were aware of what happened. The words "all that are afar off" is a reference to Gentiles.
Do you want the long of it?
Whatever you're able to do.
Then exegete the verses in front of me; and I will tell you whether you are correct or not.
No you won't. You'll probably disagree but that doesn't mean you are correct, on that basis.
Ezek 36:25-27
25 I will sprinkle clean water on you, and you will be clean; I will cleanse you from all your impurities and from all your idols.
26 I will give you a new heart and put a new spirit in you; I will remove from you your heart of stone and give you a heart of flesh.
27 And I will put my Spirit in you and move you to follow my decrees and be careful to keep my laws.
The context for these 3 verses begins at v.16 and is about the assurance of Israel's restoration. v.26 is a clear description of the new birth, and the fact that believers are "new creatures", so we know these verses are about a FUTURE time, not something that is just about to occur.
v.27 proves this with the mention of God putting His Spirit in them. Only in the NT, after Jesus' ascension is the Holy Spirit given to EVERY believer. We know this because King David asked God to NOT take the Holy Spirit from him after his grievous sin of rape and murder.
Psa 51:11.
So if v.27 applies across the board in the OT, then David's prayer was stupid and irrelevant to reality.