1 Chronicles 2:17 in the King James Version
And Abigail bare Amasa: and the father of Amasa was Jether the Ishmeelite.
Context
16 and their sisters were Zeruiah and Abigail. The sons of Zeruiah: Abishai, Joab, and Asahel, three.
17 Abigail bore Amasa; and the father of Amasa was Jether the Ishmaelite.
18 Caleb the son of Hezron became the father of children by Azubah his wife, and by Jerioth; and these were her sons: Jesher, Shobab, and Ardon.