Deuteronomy 1:3
In the fortieth year, on the first day of the eleventh month, Moses spoke to the children of Israel in accordance with all that the Lord had commanded him to say to them,
Numbers 33:38
Aaron the priest went up on Mount Hor at the command of the Lord, and died there in the fortieth year after the Israelites came out of the land of Egypt, on the first day of the fifth month.
Numbers 20:1
Then the Israelites, the whole congregation, came into the Wilderness of Zin in the first month [in the fortieth year after leaving Egypt]. And the people lived in Kadesh. Miriam died there and was buried there.
Deuteronomy 4:1-2
“Now, O Israel, listen and pay attention to the statutes and the judgments (God’s legal decisions) which I am teaching you to do, so that you may live and go in and take possession of the land which the Lord, the God of your fathers, is giving you.