‘In general, theological ethics has handled this command of God [the fourth Mosaic commandment] … with a casualness and feebleness which certainly do not match its importance in Holy Scripture or its decisive material significance’ (Church Dogmatics, 111.4, P. 50). Thus Karl Barth in the English translation of his Kirchliche Dogmatik (hereafter referred to as CD.). His own treatment is neither fragmentary nor perfunctory. There are references to ‘Sabbath’ in the indexes of six of twelve volumes of the Dogmatics so far published. The particular discussion of the Fourth Commandment occurs in his treatment of Special Ethics in CD. 111.4, where ‘the one command of God’ the Creator is set forth ‘in this particular application’ of ‘The Holy Day’ (p. 50). But for Barth the scriptural references to Sabbath rest have relevance to the doctrines of God, and Revelation; to the relation of God's Eternity to man's temporal being; to the biblical conception of Creation as the setting for the Covenant history of the Old Testament and the New Testament fulfilment of the divine purpose in redemption in Christ, to be completed and perfected in the ‘rest that remaineth to the people of God’ (Heb. 4.9). The treatment of the topic throughout the Dogmatics constitutes a corpus of exegesis and doctrine of which even a summary statement such as is here attempted might well be a useful contribution towards modern efforts at rethinking the Christian use of the Lord's Day.