'First Day' in the Bible

On the first day you shall have a holy convocation. You shall do no work of labor,

Speak to the sons of Israel saying: In the seventh month, in the first day of the month, you shall have a sabbath, a memorial summons, a holy convocation.

On the first day shall be a holy convocation. You shall do no work of labor.

Also in the fifteenth day of the seventh month, when you have gathered in the fruit of the land, you shall keep a feast to Jehovah seven days. On the first day shall be a sabbath, and on the eighth day shall be a sabbath.

And you shall take the fruit of majestic trees for yourselves on the first day, branches of palm trees, and the boughs of thick trees, and willows of the valley. And you shall rejoice before Jehovah your God seven days.