Sabbath rest is an invitation to practice for eternity. It's where we regularly, intentionally engage in God's rule and reign in our hearts and on earth. We have to shabbat in order to nuakh—to stop working and truly rest in God's presence.

Do we have to observe the Sabbath?

The fourth commandment of God's unchangeable law requires the observance of this seventh-day Sabbath as the day of rest, worship, and ministry in harmony with the teaching and practice of Jesus, the Lord of the Sabbath. ... The Sabbath is God's perpetual sign of His eternal covenant between Him and His people.

What happens if you don't observe the Sabbath?

Sabbath desecration is the failure to observe the Biblical Sabbath and is usually considered a sin and a breach of a holy day in relation to either the Jewish Shabbat (Friday sunset to Saturday nightfall), the Sabbath in seventh-day churches, or to the Lord's Day (Sunday), which is recognized as the Christian Sabbath ...