Deuteronomy 1:3
It was the fortieth year, eleventh month, on the first day of the month. Moses spoke to the children of Israel, according to all the commandments Jehovah (YHWH) gave him for them.
Numbers 33:38
Jehovah commanded Aaron the priest to go up on Mount Hor. He died there on the first day of the fifth month in the fortieth year after the Israelites left Egypt.
Numbers 20:1
In the first month the whole congregation of Israel came into the Desert of Zin, and they stayed at Kadesh. Miriam died and was buried there.
Deuteronomy 4:1-2
Israel, listen to these laws and teachings! If you obey them you will live! Go in and take the land that Jehovah the God of your fathers is giving you.