If you are a Gentile convert to Christianity, it is not a commandment of God that you celebrate the feast days. If you choose to celebrate Pentecost or any other feast day it is ok to do so as long as you make it clear that it is not an obligation.
For circumcised Jews it is a commandment. Those who are of the book of the law are required to do all of it.
Paul kept Pentecost but made it clear that the Gentiles were to do no such thing.
Acts 20:16 For Paul had determined to sail by Ephesus, because he would not spend the time in Asia: for he hasted, if it were possible for him, to be at Jerusalem the day of Pentecost.
Acts 21:25 As touching the Gentiles which believe, we have written and concluded that they observe no such thing, save only that they keep themselves from things offered to idols, and from blood, and from strangled, and from fornication.
The early church contained both circumcised Jews and uncircumcised Gentiles. Actually, it still does.
John 3:17 For God sent not his Son into the world to condemn the world; but that the world through him might be saved.
Last edited by Vic Hays; 06-17-2011 at 10:28..