Verses 12-18
The weekly day of rest (31:12-18)
People might have thought that, because the tabernacle was a sacred structure, they could work on it on the Sabbath day. God reminded them to keep the weekly Sabbath as a holy day of rest. This rest was part of God's plan for preserving the holiness of his people (12-17).
God then gave Moses the ten basic commandments of the covenant engraved on stone as he had promised (see 24:12; cf. Deuteronomy 10:4). Having received God's instructions for his people, Moses went down from the mountain to put them into practice (18).