Deuteronomy 1:3
It happened in the fortieth year, in the eleventh month, on the first day of the month, that Moses spoke to the children of Israel, according to all that the LORD had given him in commandment to them;
Numbers 33:38
Aaron the priest went up into Mount Hor at the commandment of the LORD, and died 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.
Numbers 20:1
The children of Israel, even the whole congregation, came into the wilderness of Zin in the first month: and the people stayed in Kadesh; and Miriam died there, and was buried there.
Deuteronomy 4:1-2
Now, Israel, listen to the statutes and to the ordinances, which I teach you, to do them; that you may live, and go in and possess the land which the LORD, the God of your fathers, gives you.