Bible Notes Online - 1-Chronicles 5 - ESV
Commentary

This chapter details the genealogies of those tribes that settled east of the Jordan.

v1-10: Reuben was the first born son of Jacob. He defiled his father's bed, and thus lost his birthright as first born, which passed to Joseph. Judah also gained honour, and is listed first in this book, and from whom came the line of the kings.

The natural order, whereby the firstborn had rights of inheritance are changed. This is not some arbitrary decision by a capricious deity. Rather it followed Reuben's severe moral failure (see Gen 49.4). 

There is a gap of many years between the lists in v4 and in v5. The writer records that some Reubenites were captured by Tiglath-Pileser, King of Assyria.

v11-17: The Gadites who lived in Gilead. Their names were listed in the genealogical records; even the king of Israel recognised the benefit of this.

v18-22: The tribes east of the Jordan were not ignored by God. They sought to expand their land, and were victorious against their enemies. They cried out to God in prayer.

v23-24: The tribe of Manasseh included brave and famous men.

v25-26: Although there were commendations for those tribes who lived east of the Jordan, they were unfaithful to God, and became idolatrous. For that reason, God gave them over to Tiglath-Pileser, King of Assyria. See 2 Kings 10.32-33; 17.5-6.

Note: the writer of 1 Chronicles includes specific historical incidents, and begins genealogies at specific points, e.g: v5. This is doubtless part of his aim in presenting the history of, particularly, Judah.