All these were entered in the genealogical records during the reigns of Jotham king of Judah and Jeroboam king of Israel

 1 Chronicles 5:1-26

The sons of Reuben the firstborn of Israel (he was the firstborn, but when he defiled his father’s marriage bed, his rights as firstborn were given to the sons of Joseph son of Israel; so he could not be listed in the genealogical record in accordance with his birthright, and though Judah was the strongest of his brothers and a ruler came from him, the rights of the firstborn belonged to Joseph)

All these were entered in the genealogical records during the reigns of Jotham king of Judah and Jeroboam king of Israel.

The people of the half-tribe of Manasseh were numerous; they settled in the land from Bashan to Baal Hermon, that is, to Senir (Mount Hermon).

These were the heads of their families: Epher, Ishi, Eliel, Azriel, Jeremiah, Hodaviah and Jahdiel. They were brave warriors, famous men, and heads of their families. But they were unfaithful to the God of their ancestors and prostituted themselves to the gods of the peoples of the land, whom God had destroyed before them. So the God of Israel stirred up the spirit of Pul king of Assyria (that is, Tiglath-Pileser king of Assyria), who took the Reubenites, the Gadites and the half-tribe of Manasseh into exile. He took them to Halah, Habor, Hara and the river of Gozan, where they are to this day.

Why?

These records show us how the genealogical records are known to our generations after so many years.

A bad example like Ruben's may remind us not to do evil things.

Above two and a half tribes were destroyed first on the east side of the Jordan River, for they were unfaithful to the God of their fathers and prostituted themselves to the gods of the peoples of the land.

How?

Keep the record remind us and let our following generation know what happened before to praise our Lord! May my heart be faithful to God forever!