Among the many changing practices during the Reformation, Sabbath observance gained increasing importance as interpretations and practices evolved, leading to divisions among different traditions and disagreements within those traditions. Sabbath theology helped distinguish confessional identity. This study aims to delve deeper into Swiss Reformed interpretations of specific Scriptures that provide the basis for theological conclusions and practical applications regarding Sabbath. It focuses on four key passages in Isaiah (1:13–15, 56:2–8, 58:13–14, and 66:22–24) that contributed to the biblical basis for interpretations of Sabbath among the reformers. By comparing interpretations, we gain a more complete picture of the Swiss Reformed perspectives on Sabbath and observe a pattern of religious change as these religious ideas spread across different regions of the Swiss Confederation from the 1520s to the 1580s. The Swiss Reformed interpreters include Johannes Oecolampadius (1482–1531) in Basel, Ulrich Zwingli (1484–1531) and Konrad Pellikan (1478–1556) in Zurich, Wolfgang Musculus (1497–1563) in Bern, and Heinrich Bullinger (1504–1575) and Rudolf Gwalther (1519–1586) in Zurich again. The questions addressed in working through their interpretations include which meanings of Sabbath they emphasize, distinctions they make regarding the Sabbath commandment, aspects of Sabbath they think are perpetual, and the day of the week they argue Christians should observe Sabbath. This portrait of Sabbath interpretations among the Swiss Reformed depicts the gradual development toward stricter and more comprehensive views on Sabbath practice among Reformed Christians and gives voice to the unique understandings of these individual Swiss Reformed theologians in the sixteenth century.
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