Albert Barnes Commentary Nehemiah 1:4

"And it came to pass, when I heard these words, that I sat down and wept, and mourned certain days; and I fasted and prayed before the God of heaven," — Nehemiah 1:4 (ASV)

The God of heaven - This title of the Almighty, which is Persian rather than Jewish (see 2 Chronicles 36:23; Ezra 1:2 note; Ezra 6:10; Ezra 7:12, 21), is a favorite one with Nehemiah, who had been born and brought up in Persia.