Deuteronomy 1:3
{And it was} in the fortieth year, on the eleventh month, on [the] first [day] of the month, Moses spoke to the {Israelites} according to all that Yahweh had instructed him [to speak] to them.
Numbers 33:38
Aaron the priest went up to Mount Hor at the {command} of Yahweh, and he died there in the fortieth year after the {Israelites} had gone out from the land of Egypt, in the fifth month on the first [day] of the month.
Numbers 20:1
Then the entire community of the {Israelites} came [to] the desert of Zin on the first month, and the people stayed in Kadesh; Miriam died and was buried there.
Deuteronomy 4:1-2
"Now, Israel, listen to the rules and to the regulations that I [am] teaching you to do, in order that you may live and you may go [in] and you may take possession of the land that Yahweh, the God of your ancestors, [is] giving to you.