Albert Barnes Commentary Nehemiah 4:7

"But it came to pass that, when Sanballat, and Tobiah, and the Arabians, and the Ammonites, and the Ashdodites, heard that the repairing of the walls of Jerusalem went forward, [and] that the breaches began to be stopped, then they were very wroth;" — Nehemiah 4:7 (ASV)

The Arabians ... - Probably a band, composed largely of Arabians, Ammonites, and Ashdodites, which Sanballat maintained as a guard to his person, and which formed a portion of the army of Samaria (Nehemiah 4:2). A quarrel between such a band and the people of Jerusalem might be overlooked by the Persian king.