The fourth commandment specifies the seventh day, and most of Christianity keeps the first — a substitution made early, attested by the second century, and never given a thorough scriptural argument so much as a practice that hardened. Seventh-day Adventists and Seventh Day Baptists reject it and keep Saturday, and Adventist teaching makes the Sabbath a test of faithfulness, which is why the group is the most visible dissenter here. Sunday trading laws held across much of the West into the 1990s and were dismantled with little religious resistance; the practical result is that the people least able to refuse work — retail, care, delivery, hospitality — are exactly those the commandment was framed to protect, since its own wording extends the rest to servants, livestock and the resident foreigner. Jewish practice preserved the day by building an enormous body of law around it; Christianity did not, and lost it.