'First Day' in the Bible

And the Lord said to Moses in the waste land 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,

And they got together all the people on the first day of the second month; and everyone made clear his family and his father's house, by the number of the names, from twenty years old and over.

And he who made his offering on 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 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;

On the first day there is to be a holy meeting: you may do no sort of field-work:

In the seventh month, on the first day of the month, let there be a holy meeting; on it you may do no field-work; let the day be marked by the blowing of horns;

And Aaron the priest went up into the mountain at the order of the Lord, and came to his death there, in the fortieth year after the children of Israel had come out of the land of Egypt, in the fifth month, on the first day of the month.