an'-ses-ters (ri'shonim, "first ones"): The word ancestor appears in the English Bible only once (Le 26:45). The Hebrew word, the ordinary adjective "first," occurs more than 200 times, and in a few places might fairly be rendered ancestors (e.g. De 19:14; Jer 11:10). In speaking of ancestors the Old Testament ordinarily uses the word for "fathers" ('abhoth).
The International Standard Bible Encyclopedia
Ancestors
The International Standard Bible Encyclopedia, James Orr (1915). Public domain, from the CrossWire SWORD module.