Numbers 33:4 (BSB)

who were burying all their firstborn, whom the LORD had struck down among them; for the LORD had executed judgment against their gods.

From Numbers 33. Also in the ESV.

Commentary on Numbers 33:4

• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Numbers 33:4: For the Egyptians buried all their firstborn, which the Lord had smitten among them,.... Which contributed much to the more easy and safe deliverance of the children of Israel; for their hearts were heavy with sorrow, and their hands were full, and they had other work to do, namely, to bury their dead, than to molest Israel; and besides, they knew it was for detaining...
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on Numbers 33:4: upon their gods--used either according to Scripture phraseology to denote their rulers (the first-born of the king and his princes) or the idolatrous objects of Egyptian worship.
• Geneva Bible Notes (Reformed), Geneva Bible Study Notes on Numbers 33:4: For the Egyptians buried all [their] firstborn, which the LORD had smitten among them: upon their gods also the LORD executed judgments. (b) Either meaning their idols, or their men of authority.
• Keil & Delitzsch (Lutheran), Biblical Commentary on the Old Testament on Numbers 33:1-15: Num 33:1-15 The first and second verses form the heading: “These are the marches of the children of Israel, which they marched out,” i.e., the marches which they made from one place to another, on going out of Egypt. מסּע does not mean a station, but the breaking up of a camp, and then a train, or march (see at Exo 12:37, and Gen 13:3). לצבאתם (see Exo 7:4).