John Gill Commentary Nehemiah 13:7

"and I came to Jerusalem, and understood the evil that Eliashib had done for Tobiah, in preparing him a chamber in the courts of the house of God." — Nehemiah 13:7 (ASV)

And I came to Jerusalem
Through the king's leave, and with a commission from him:

and understood of the evil that Eliashib did for Tobiah ;
was informed of the mal-administration of his office:

in preparing him a chamber in the courts of the house of God ;
whereby it was profaned and polluted.