'First Day' in the Bible

on the first day ye have a holy convocation, ye do no servile work;

on the first day is a holy convocation, ye do no servile work,

Only -- in the fifteenth day of the seventh month, in your gathering the increase of the land, ye do keep the feast of Jehovah seven days; on the first day is a sabbath, and on the eighth day a sabbath;

and ye have taken to yourselves on the first day the fruit of beautiful trees, branches of palms, and boughs of thick trees, and willows of a brook, and have rejoiced before Jehovah your God seven days.