|Easton's Bible Dictionary|
Rust, (1 Chronicles 4:5, 7), one of the wives of Ashur.
Int. Standard Bible Encyclopedia
he'-la (chel'ah): A wife of Ashhur, father of Tekoa (1 Chronicles 4:5, 7).
Helah (2 Occurrences)
1 Chronicles 4:5 Ashhur the father of Tekoa had two wives, Helah and Naarah. (WEB KJV JPS ASV BBE DBY WBS YLT NAS RSV NIV)
1 Chronicles 4:7 The sons of Helah were Zereth, Izhar, and Ethnan. (WEB KJV JPS ASV BBE DBY WBS YLT NAS RSV NIV)