Could you please explain how the church was born on the day of pentacost. In mathew 18:17 Jesus said to "tell it unto the church" Why would Jesus tell people to tell it to the church if the church did not even exist yet?
Hi there... the proper translation of the word ekklesia IS assembly or congrgation.
Matthew 18:17 (Young's Literal Translation)
Young's Literal Translation (YLT)
17`And if he may not hear them, say [it] to the assembly, and if also the assembly he may not hear, let him be to thee as the heathen man and the tax-gatherer.
17 But if he fails to hear them, tell it to the assembly. And if he also fails to hear the assembly, let him be to you as the nations and the tax collector. (Green's literal LITV)
The simplist answer to your question is the one Pret posted on page one;
Pentecost at this point in time (or Shavuot as they would have know it), was the last days of the Old Covenant. The ushering in of the New Covenant was when The Holy Spirit was poured out to the masses that gathered at the Feast. Joel predicted it in Joel 2:28; all Peter did was remind them of the prophesy.
Remember in OT times, the Spirit indwelled, did His work then moved on. All that changed on this glorious day some 2,000 years ago.