Acts 3:19 Repent ye therefore, and be converted, that your sins may be blotted out, when the times of refreshing shall come from the presence of the Lord;
3:20 And he shall send Jesus Christ, which before was preached unto you:
3:21 Whom the heaven must receive until the times of restitution of all things, which God hath spoken by the mouth of all his holy prophets since the world began.
Peter preached Christ.
Peter preached Christ would be sent if Israel repented.
Peter preached Christ according to what all the prophets spoke since the world began.
Romans 16:25 Now to him that is of power to stablish you according to my gospel, and the preaching of Jesus Christ, according to the revelation of the mystery, which was kept secret since the world began,
Paul preached Christ.
Paul preached Christ according to the mystery, which was kept secret since the world began.
If Paul preached the gospel and Christ according to the mystery kept secret since the world began, Peter could not be preaching the same gospel as Paul seeing that what Paul preached was kept secret from him.
[Eph 3:3-5 KJV] 3 How that by revelation he made known unto me the mystery; (as I wrote afore in few words, 4 Whereby, when ye read, ye may understand my knowledge in the mystery of Christ) 5 Which in other ages was not made known unto the sons of men, as it is now revealed unto his holy apostles and prophets by the Spirit;
The mystery could not have been preached by Peter seeing that the mystery was not made known until revealed to Paul.
What was preached since the world began can not be the same thing if it was kept secret since the world began.
3:20 And he shall send Jesus Christ, which before was preached unto you:
3:21 Whom the heaven must receive until the times of restitution of all things, which God hath spoken by the mouth of all his holy prophets since the world began.
Peter preached Christ.
Peter preached Christ would be sent if Israel repented.
Peter preached Christ according to what all the prophets spoke since the world began.
Romans 16:25 Now to him that is of power to stablish you according to my gospel, and the preaching of Jesus Christ, according to the revelation of the mystery, which was kept secret since the world began,
Paul preached Christ.
Paul preached Christ according to the mystery, which was kept secret since the world began.
If Paul preached the gospel and Christ according to the mystery kept secret since the world began, Peter could not be preaching the same gospel as Paul seeing that what Paul preached was kept secret from him.
[Eph 3:3-5 KJV] 3 How that by revelation he made known unto me the mystery; (as I wrote afore in few words, 4 Whereby, when ye read, ye may understand my knowledge in the mystery of Christ) 5 Which in other ages was not made known unto the sons of men, as it is now revealed unto his holy apostles and prophets by the Spirit;
The mystery could not have been preached by Peter seeing that the mystery was not made known until revealed to Paul.
What was preached since the world began can not be the same thing if it was kept secret since the world began.