The seventh day was the day of rest, the Sabbath. The structure of verses 2 and 3 in the Hebrew is well ordered in its clauses with parallel emphases on the adjective seventh. The number “seven” often represents the covenant (the verb “swear” is related etymologically); thus, it is no surprise that the Sabbath became the sign of God’s covenant at Sinai (Ex. 31:13, 17).
God blessed the seventh day and made it holy (sanctified it) because it commemorated the completion or cessation of His creative work. God’s Sabbath rest became a predominant motif of Scripture. Here before the Fall it represented the perfect Creation, sanctified and at rest. After the Fall, this rest became a goal to be sought. The establishment of theocratic rest in the land, whether by Moses or by Joshua at the Conquest, demanded faith and obedience. Today believers enter into that Sabbath rest spiritually (Heb. 4:8-10) and will certainly share in its full restoration.