Deuteronomy 1:3
And it came to pass, in the fortieth year, in the eleventh month, on the first of the month, that Moses spake unto the sons of Israel, according to all that Yahweh had given him in charge for them;
Numbers 33:38
and Aaron the priest went up into Mount Hor, at the bidding of Yahweh, and died there, in the fortieth year, by the coming forth of the sons of Israel out of the land of Egypt, in the fifth month, on the first of the month.
Numbers 20:1
Then came the sons of Israel the whole assembly, into the desert of Zin in the first month, and the people dwelt in Kadesh, - and Miriam died there, and was buried there.
Deuteronomy 4:1-2
Now, therefore, O Israel, hearken thou unto the statutes, and unto the regulations, which, I, am teaching you, to do them , - to the end ye may live and enter and possess the land, which, Yahweh, the God of your fathers, is giving unto you.