And Abigail bore Amasa: and the father of Amasa was Jether the Ishmaelite.
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George Leo Haydock
AD 1849
Ismahelite, or more correctly, "Jethra, of Jezrahel "(2 Kings xvii. 25.) though the Hebrew and Septuagint in that place read "Israelite "which would be a trifling remark; and it is improbable that Isai would give his daughter to a descendant of Ismahel. (Calmet)
The person might, however, have resided among them. (Du Hamel)