2 Samuel 20:4

Meanwhile, David ordered Amasa, "Muster the army of Judah here within three days, and be here yourself!"

2 Samuel 17:25

Absalom had installed Amasa in place of Joab over the army. (Amasa was the son of a man named Jether the Ishmaelite. His mother was Abigail, a daughter of Nahash and a sister of Zeruiah, Joab's mother.)

2 Samuel 19:13

Then ask Amasa, "Aren't you my own flesh and blood? So may God deal with me, no matter how severely, if from this day forward you don't take Joab's place as commander of my army.'

1 Chronicles 2:17

Zeruiah's three sons were Abishai, Joab, and Asahel. Abigail bore Amasa, whose father was Jether the Ishmaelite.

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