The Rule of St. Benedict

The brethren who are at work too far away, and cannot come to the oratory at the appointed time, and the Abbot hath assured himself that such is the case—let them perform the Work of God in the fear of God and on bended knees where they are working. In like manner let those who are sent on a journey not permit the appointed hours to pass by; but let them say the office by themselves as best they can, and not neglect to fulfil the obligation of divine service.