“The seventh day is the Sabbath of the Lord.” Ex. 20:10.
16. By whose Spirit did the prophets write?
“The Spirit of Christ which was in them.” 1 Peter 1:11.
17. What does the prophet Isaiah, speaking for God through this Spirit of Christ, call the seventh-day Sabbath?
“My holy day.” Isa. 58:13.
18. Does Christ anywhere in the Scriptures ever claim any other day of the week than the seventh as His?
He does not.
Note.—We do not need to speculate as to what day is the Lord's, if we will but take the Word of God for our guide, for loyalty to which John was banished to the isle of Patmos. See Rev. 1:9.
19. If John, therefore, referred to a day of the week, on what day must he have been in the Spirit?
The seventh day.