The fact that the mass was originally written for Pentecost is evidenced by the presence of the two Alleluias and the Veni Sancte Spiritus. However, Pärt has also set two Alleluia verses to permit the work to be used at Christmas.
There are indications that the mass was initially written for Pentecost, as evidenced by the inclusion of two Alleluias and Veni Sancte Spiritus. Additionally, Pärt composed two Alleluia verses so the piece could be utilized during Christmas.