Leviticus 23:2-3

Brenton(i) 2 Speak to the children of Israel, and thou shalt say unto them, The feasts of the Lord which ye shall call holy assemblies, these are my feasts. 3 Six days shalt thou do works, but on the seventh day is the sabbath; a rest, a holy convocation to the Lord: thou shalt not do any work, it is a sabbath to the Lord in all your dwellings.