John Dummelow's Commentary on the Bible - Exodus 13:1-22
The Consecration of the Firstborn. The March to Etham1-16. The Consecration of the Firstborn.All Israel was holy unto the Lord: see on Exodus 19:5, Exodus 19:6. But the firstborn of man and beast were specially consecrated to Him, as the part representing the whole. There was a special fitness in the consecration of the firstborn, seeing they had been spared in the destruction which overtook the Egyptians. The firstborn of mankind were to be consecrated to the service of Jehovah as priests; the... read more
Expository Notes of Dr. Thomas Constable - Exodus 13:17-22
1. The journey from Succoth to Etham 13:17-22"The way of the land of the Philistines" refers to the most northern of three routes travelers took from Egypt to Canaan (Exodus 13:17). The others lay farther south. The Egyptians had heavily fortified this caravan route, also called the Via Maris (the way of the sea). The Egyptians would have engaged Israel in battle had the chosen people gone that way.The people marched in an orderly fashion (Exodus 13:18). This is the meaning of "martial array."... read more