1)
What are his first and latter matters?
1.
Malbim: The first are before he sinned. The latter are after he sinned.
2)
Where are the words of Shemayah and Ido written?
1.
'Rashi': Every Navi used to write a Sefer of his prophecies. Shemayah was mentioned above (11:2) and below (13:22) it says "v'Yeser Divrei Aviyah? Kesuvim b'Midrash ha'Navi Ido. His Sefer was called Midrash.
3)
What is the meaning of "Lehisyaches"?
1.
Radak: The words of Shemayah and Ido pertain to the kings and their lineage.
2.
Malbim: Ido wrote a Sefer of the lineage of Beis David, and he also wrote the wars between Rechav'am and Yaravam all their days. Shemayah wrote the rest of the matters.
