Charles Spurgeon Commentary Jeremiah 9:4

"Take ye heed every one of his neighbor, and trust ye not in any brother; for every brother will utterly supplant, and every neighbor will go about with slanders." — Jeremiah 9:4 (ASV)

It was an evil time indeed when, even in the domestic circle, there could be no brotherly confidence. Every brother will utterly supplant. Jacob's name, you remember, was supplanter; and all these men were Jacobs, each one ready to supplant his brother, to throw him on one side that he might occupy his place. As to neighbourly conduct, there was none; the neighbours were all gossips and slanderers of one another.