Your question was automatiy answered in that post - WITHIN those very passages I cited in which how Israel fell is depicted.
Here is another way of saying some of what I posted...and while I'm at it, a word or two on the water baptism issue, to others in general...
What "economy" had been in place prior to Acts 9?
John 5:43 I am come in my Father's name, and ye receive me not: if another shall come in his own name, him ye will receive. 5:44 How can ye believe,
which receive honour one of another, and seek not the honour that cometh from God only?
Romans 2:28 For he is not a Jew, which is one outwardly; neither is that circumcision, which is outward in the flesh: 2:29 But he is a Jew, which is one inwardly; and circumcision is that of the heart, in the spirit, and not in the letter;
whose praise is not of men, but of God.
John 5:45 Do not think that I will accuse you to the Father: there is one that accuseth you, even
Moses, in whom ye trust. 5:46 For had ye believed Moses, ye would have believed me: for he wrote of me. 5:47
But if ye believe not his writings, how shall ye believe my words?
Romans 2:23 Thou that makest thy boast of the law,
through breaking the law dishonourest thou God? 2:24 For the name of God is blasphemed among the Gentiles through you, as it is written. 2:25 For circumcision verily profiteth, if thou keep the law:
but if thou be a breaker of the law, thy circumcision is made uncircumcision.
What "economy" does all that appear to be describing as having taken place within?
The Law (and the Prophets).
Which was why water baptism to begin with - the Law and the Prophets.
John 1:24 And they which were sent were of the Pharisees. 1:25 And they asked him, and said unto him, Why baptizest thou then, if thou be not that Christ, nor Elias, neither that prophet?
Oh I know what you'll now attempt to point out.
To that issue then...this in verse 17...
John 1:15 John bare witness of him, and cried, saying, This was he of whom I spake, He that cometh after me is preferred before me: for he was before me. 1:16 And of his fulness have all we received, and grace for grace. 1:17 For the law was given by Moses, but grace and truth came by Jesus Christ.
THAT is THIS Grace here - a PROPHESIED Grace...
Romans 15:8 Now I say that Jesus Christ was a minister OF THE CIRCUMCISION for the truth of God, TO CONFIRM THE PROMISES MADE UNTO THE FATHERS: 15:9 And that the Gentiles might glorify God for his mercy; AS IT IS WRITTEN, For this cause I will confess to thee among the Gentiles, and sing unto thy name. 15:10 And again he saith, Rejoice, ye Gentiles, WITH HIS PEOPLE.
Matthew 11:13 For all the prophets and the law prophesied until John. 11:14 And if ye will receive it, this is Elias, which was for to come.
All the prophets and the law prophesied until John.
BUT NOW He Whom they had Prophesied OF was in their midst.
BUT He himself had also said...
Matthew 5:17 Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil. 5:18 For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled.
They were STILL under THAT Economy - of the Law and the Prophets.
5:19 Whosoever therefore shall break one of these least commandments, and shall teach men so, he shall be called the least in the kingdom of heaven: but whosoever shall do and teach them, the same shall be called great in the kingdom of heaven. 5:20 For I say unto you, That except your righteousness shall exceed the righteousness of the scribes and Pharisees, ye shall in no case enter into the kingdom of heaven.
Further...
Matthew 23:1 Then spake Jesus to the multitude, and to his disciples, 23:2 Saying, The scribes and the Pharisees sit in Moses' seat: 23:3
All therefore whatsoever they bid you observe, that observe and do; but do not ye after their works: for they say, and do not.
John 1:24 And they which were sent were of the Pharisees. 1:25 And they asked him, and said unto him, Why baptizest thou then, if thou be not that Christ, nor Elias, neither that prophet?
Which, is why water baptism - Moses' Seat...
Matthew 28:19 Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost: 28:20
Teaching them to observe all things whatsoever I have commanded you: and, lo, I am with you alway, even unto the end of the world. Amen.
Rom. 5: 6-8.