3 In the fortieth year, on the first day of the eleventh month, Moses proclaimed to the Israelites all that the LORD had commanded him concerning them.

Read Deuteronomy 1:3 Using Other Translations

And it came to pass in the fortieth year, in the eleventh month, on the first day of the month, that Moses spake unto the children of Israel, according unto all that the LORD had given him in commandment unto them;
In the fortieth year, on the first day of the eleventh month, Moses spoke to the people of Israel according to all that the LORD had given him in commandment to them,
But forty years after the Israelites left Egypt, on the first day of the eleventh month, Moses addressed the people of Israel, telling them everything the LORD had commanded him to say.