Smith's Bible Dictionary
Abisha'i or Abish'a-i. (father of a gift). The eldest of the three sons of Zeruiah, David's sister, and brother to Joab and Asahel. 1 Chronicles 2:16. Like his two brothers he was the devoted follower of David. He was his companion in the desperate night expedition to the camp of Saul. 1 Samuel 26:6-9. (B.C. 1055).
On the outbreak of Absalom's rebellion, he remained true to the king, and commanded a third part of the army in the decisive battle against Absalom. He rescued David from the hands of the gigantic Philistine, Ishbi-benob. 2 Samuel 21:17. His personal prowess on this, as on another occasion, when he fought single-handed against three hundred, won for him a place as captain of the second three of David's mighty men. 2 Samuel 23:18; 1 Chronicles 11:20.
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Smith, William, Dr. Entry for 'Abishai'. Smith's Bible Dictionary. https://www.studylight.org/​dictionaries/​eng/​sbd/​a/abishai.html. 1901.