What did Hashem put in his heart?
Malbim: He put counsel to gather them to investigate their lineage. Amidst this, he found a Sefer of lineage.
Who are "Chorim"?
Ibn Ezra: The Targum of Lavan (white) is Chiver. It is an esteemed color. Due to this, [esteemed people] are called Chorim.
What is "Lehisyaches"?
Rashi: To investigate lineage. Ibn Ezra - now that the city wall was finished, he wanted to clarify their lineage, lest strangers mix with them.
Who are "ha'Olim ba'Rishonah"?
Rashi: Those who ascended first with Ezra.
What was written in the Sefer?
Rashi: All these matters written afterwards, until "v'Goralos Hipalnu Al Korban ha'Etzim" (10:35).
