Then Moses and Aaron went and assembled all the elders of the Israelites,
29. And Moses and Aaron went. We are here briefly told how faithfully and religiously the two brothers executed the commands of God. They gather together the elders of the people, because the mighty multitude, as we are told they were, could not be collected in one place.
Moses neglected to circumcise his son, likely because he was too fond of his Midianite wife and too indulgent of her will, and so God met him in anger to kill him. Omissions are sins; the neglect of the covenant's seals shows we undervalue the promises and despise the conditions. Even good men grow slack in duty when cut off from the company of the faithful.
AI summary
Commenting on Exodus 4:24-31
And Aaron spake all the words which the Lord had spoken unto Moses,.... As Moses had related to him, being his mouth and spokesman: and did the signs in the sight of the people; not Aaron, but Moses, and these were the turning of his rod into a serpent, and the serpent into a rod again; putting his hand into and out of his bosom...