Numbers 1:1 - Clarke's commentary and critical notes on the Bible

And the LORD spake unto Moses in the wilderness of Sinai, in the tabernacle of the congregation, on the first day of the second month, in the second year after they were come out of the land of Egypt, saying, The Lord spake unto Moses - on the first day of the second month - As the tabernacle was erected upon the first day of the first month, in the second year after their coming out of Egypt, Exodus 40:17; and this muster of the people was made on the first day of the second month, in the same year; it is evident that the transactions related in the preceding book must all have taken place in the space of one month, and during the time the Israelites were encamped at Mount Sinai, before they had begun their Journey to the promised land.