O God, who in the exaltation of thy Son Jesus Christ dost sanctify thy universal Church: Shed abroad in every race and nation the gift of the Holy Spirit; that the work wrought by his power at the first preaching of the gospel may now be extended throughout the whole world; through the same Jesus Christ our Lord.
This is very far from definitive, but I’ve been able to get “universam ecclesiam” to occur at only one point of relevance in the H. A. Wilson edition of the Gelasian, and there (http://hdl.handle.net/2027/mdp.39015006952322?urlappend=;seq=214) the prayer matches this one (https://babel.hathitrust.org/cgi/pt?id=hvd.32044081840076;view=1up;seq=84), which is worded somewhat differently. (Haven’t looked very hard, though.)
I.e. https://catalog.hathitrust.org/Record/002243617 p. 122 matches https://catalog.hathitrust.org/Record/011601783 pp. 62-63 (hope those links work).
This version of the prayer, though heavily indebted to the Gelasian sacramentary, comes not from there, but from the American edition of the Grey book of 1933. The prayer in the Gelasian, though, is the Collect for the Mass during the Day on Pentecost Sunday in the current Missale Romanum. See http://liberlocorumcommunium.blogspot.com/2016/05/an-ancient-collect-for-pentecost.html.