Biblical Differences Between Saturday and Sunday

The primary difference between Saturday and Sunday is that Saturday is the seventh day of the week, specifically designated by God as the Sabbath, while Sunday is the first day of the week and is a day of ordinary business in Bible timeSTSG 12.2+1.

The Distinction in Biblical Time and Origin

• The Seventh Day (Saturday): God identified the seventh day at creation by resting upon it, blessing it, and sanctifying it Genesis 2:2-3TDOC 196.1. It is the Sabbath of the fourth commandment, fixed by the Lord during the forty years in the wilderness and observed by the people of Israel in an unbroken count to this daySTSG 12.2+1.

• The First Day (Sunday): In the New Testament, the Sabbath is already past before the first day of the week begins Mark 16:1-2NSLRLL 174.1. Sunday was originally a day of labor and ordinary business in the early church, and there is no biblical command to keep it holy or any statement that God transferred the Sabbath blessing to itRCSK 4.2+2.

Measurement of Time

• Bible Time: A Bible day is measured from evening to evening, or sundown to sundown Leviticus 23:32STSG 12.2. Therefore, the seventh-day Sabbath technically begins Friday evening at sunset and ends Saturday evening at sunsetSTSG 12.2.

• Roman Time: The nations today follow Roman time, which measures a day from midnight to midnightSTSG 12.2. In this system, Saturday begins at midnight Friday and Sunday begins at midnight SaturdaySTSG 12.2.

The Source of Authority

• Divine Commandment: The observance of Saturday as the Sabbath is based on the law of God and His own example at creation7BC 983.7+1. Jesus Christ, as the "One Lawgiver" who spoke from Sinai, emphasized the binding claims of the seventh-day Sabbath throughout His ministryRR 64.7+2.

• Human Innovation: The change from the seventh day to the first day was brought about by the "man of sin" or the Papacy, rather than by divine authorityCET 86.2+2. This change was later reinforced by the edicts of emperors like Constantine, who designated Sunday as a "venerable day of the sun" rather than a Christian festivalHSFD 345.1+2.

The Spiritual Significance

• A Sign and Seal: The Sabbath is a sign between God and His people, serving as a memorial of His creative and redemptive power Ezekiel 20:20PTUK April 4, 1895, page 214.5+1. Keeping the true Sabbath is a test of loyalty to God in the last days15MR 15.3+1.

• Rest in Christ: True Sabbath-keeping is more than physical rest; it is a sign of perfect trust in the righteousness of God and the "Real Presence" of Christ in the soulMEDM June 10, 1908, page 471.7+1. While men may observe Sunday for convenience or due to tradition, it lacks the divine sanctification found only in the seventh daySOSL 126.2+2.