Calendar Series
Heb 4:4 "For he spake in a certain place of the seventh day on this wise, And God did rest the seventh day from all his works."
Heb 4:8-10 "For if Jesus had given them rest, then would he not afterward have spoken of another day. There remaineth therefore a rest to the people of God.For he that is entered into his rest, he also hath ceased from his own works, as God did from his."
In these texts, the author of Hebrews compares Sabbath rest with the spiritual rest of salvation. The seventh day is plainly displayed as the Sabbath. Faith is involved with keeping the seventh day as it is with the “rest” of salvation. There remains a day of rest because it does not say it was changed or the “rest” of salvation is not compared to any other day. Entering into God’s rest includes belief:
Heb 4:11 "Let us labour therefore to enter into that rest, lest any man fall after the same example of unbelief."
Belief also includes Faith in which day is the Sabbath. “Labor” to know God‘s truth and don’t enter into unbelief.