The most important preparation ezra made for his journey was securing generous support for his mission from artaxerxes.

check explanation.

Explanation:

The main question is; What was the most important preparation Ezra made for the journey to Jerusalem?

Ezra was a leader of the Jews who returned from exile in Babylon. Ezra can be likened to be a reformer who reconstituted isreal laws during his time.

And the answer to this question can be found in the Book of the Bible; the book of Ezra chapter 7 verse 10. It says; '' for Ezra had prepared his heart to seek the law of the LORD, and to do it, and to teach in Israel statutes and judgement''(- EXPOSITORY ENGLISH BIBLE version).

Ezra was granted all his requests because he had prepared his heart to seek the law of the Lord. With these, God used the King of Babylon, Artaxerxes greatly for him.

God favoured Ezra because he had set up his heart on learning God's ordinances,doing it, and teaching it to others

answer; /// the above statement is (true);

answer; posthypnotic;