'First Day' in the Bible

And LORD spoke to 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 came 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 ancestry after their families, by their fathers' houses, according to the number of the names, from twenty years old and

And he who offered his oblation the first day was Nahshon the son of Amminadab, of the tribe of Judah.

In the first day shall be a holy convocation. Ye shall do no servile work.

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 to you.

And Aaron the priest went up onto mount Hor at the commandment of LORD, and died there, in the fortieth year after the sons of Israel came out of the land of Egypt, in the fifth month, on the first day of the month.