'First Day' in the Bible

And Jehovah spake unto Moses in the wilderness of Sinai, in the tent of meeting, on the first day of the second month, in the second year after they were come out of the land of Egypt, saying,

And they assembled all the congregation together on the first day of the second month; and they declared their pedigrees after their families, by their fathers houses, according to the number of the names, from twenty years old and upward, by their polls.

And he shall again consecrate to Jehovah the days of his separation, and shall bring a yearling lamb for a trespass-offering. But the first days are forfeited, for his consecration hath been defiled.

And he that offered his offering the first day was Nahshon the son of Amminadab, of the tribe of Judah:

And on days of joy and on your regular feasts and on the first day of every month, let the horns be sounded over your burned offerings and your peace-offerings; and they will put the Lord in mind of you: I am the Lord your God.

and all that the LORD hath commanded you by the hand of Moses, from the first day forward that the LORD commanded among your generation:

And on the first day of every month you are to give a burned offering to the Lord; two oxen, one male sheep, and seven he-lambs of the first year, without any mark;

In the first day shall be an holy convocation; ye shall do no manner of servile work therein:

"On the first day of your harvest season, you are to hold a sacred assembly when you present your first fruits during the Festival of Weeks. No servile work is to be done.

And in the seventh month, on the first day of the month, ye shall have a holy convocation; ye shall do no servile work: it is a day of blowing of trumpets unto you.

And Aaron the priest went up into mount Hor at the commandment of Jehovah, and died there, in the fortieth year after the children of Israel were come out of the land of Egypt, in the fifth month, on the first day of the month.