 He was ordained on 25 May 1922 by bishop Gottfrid Billing and moved to Väsby to begin his work as a priest.Rosendal had many contacts to the liturgical movement in the Roman Catholic church, especially in Benedictine monasteries, and knew personally many theologians of the liturgical and ecumenical movement, such as Pius Parsch and Paul Couturier.He also had plenty of contacts with Anglo-Catholicism in the Church of England, e.g.