 And that day, when you start that count, is the day the disciples of Jesus first saw him alive after he was raised from the dead. Now, there's a curious thing about that day, but I'm obviously going to have to explain that. Pentecost is a feast with three names. The Old Testament names for Pentecost are the Feast of Firstfruits and the Feast of Weeks, this latter being Shavuot in Hebrew, which means week's.