What had Ezra set his heart to do, according to Ezra 7:10?

Answer: Study, practice and teach the Law

Ezra had set his heart to study the Law of the LORD, to practice it, and to teach its statutes and ordinances in Israel.

“For Ezra had set his heart to study the Law of the LORD, to practice it, and to teach its statutes and ordinances in Israel.”— Ezra 7:10 (BSB)