Verses with the word pentecost in the Apocrypha (2 verses):

Tobit 2:1
Now when I was come home again, and my wife Anna was restored unto me, with my son Tobias, in the feast of Pentecost, which is the holy feast of the seven weeks, there was a good dinner prepared me, in the which I sat down to eat.

2 Maccabees 12:32
And after the feast, called Pentecost, they went forth against Gorgias the governor of Idumea,