'First Day' in the Bible

On the first day [there] shall be a holy assembly for you; you shall not do {any regular work}.

On the first day [there shall be] a holy assembly; you must not do any {regular work}.

" 'Surely on the fifteenth day of the seventh month, at your gathering the land's produce, you shall hold Yahweh's festival for seven days; on the first day [there shall be] a rest period and on the eighth day a rest period.

And on the first day you shall take for yourselves the first fruit of majestic trees, branches of palm trees and branches of a leafy tree and of a brook's poplar trees, and you shall rejoice {before} Yahweh your God [for] seven days.