Leviticus 23:1-3

1 Yahweh spoke to Moses, saying,  2 "Speak to the children of Israel, and tell them, 'The set feasts of Yahweh, which you shall proclaim to be holy convocations, even these are my set feasts.

3 "'Six days shall work be done: but on the seventh day is a Sabbath of solemn rest, a holy convocation; you shall do no manner of work. It is a Sabbath to Yahweh in all your dwellings.