What DID the apostles preach?
Peter said: ”Listen to what I have to say. Y’shua of Nazareth, a man attested to you by God with deeds of power, wonders, and signs that God did through him among you, as you yourselves know—this man, handed over to you according to the definite plan and foreknowledge of God, you crucified and killed by the hands of those outside the law. But God raised him up, having freed him from death. (Act 2 NRSV)
Peter continued to preach about Y’shua, and concluded his sermon by saying: “Therefore let the entire house of Israel know with certainty that God has made him (Y’shua haMashiach), both Lord AND Messiah, this Y’shua whom you crucified” (verse 36). He told the people to repent, and they would know that their sins were forgiven (verse 38).