Commentary for Proverbs 20:21

An inheritance may be acquired hastily in the beginning Which one hastened to take hurriedly, e.g. the sons of Gad and the sons of Reuben, who hastened to take their share on the other side of the Jordan, and they spoke hastily, as it is said (Num. 32:16): “We want to build sheepfolds for our cattle here and cities for our children.” They made the main thing of secondary import, for they placed their flocks before their children.

but its end will not be blessed For they were exiled many years before the rest of the tribes, as is explained in Seder Olam (ch. 22), and in the Midrash of Rabbi Tanhuma (see Mattoth 7): “In the second year of Ahaz, the Lord aroused the desire of the king of Assyria, etc. (I Chron. 5:26),” but the rest of the tribes were exiled in the sixth year of Hezekiah, which is the ninth year of Hoshea the son of Elah.