The short answer:
Benaiah was one of King David’s special forces. Benaiah also served under Solomon and performed many incredible feats of strength, as listed in 2 Samuel/2 Kingdoms 23:20-23.
What did Benaiah do in the bible?
Benaiah, son of Jehoiada was one of King David’s “mighty men,” listed in the Old Testament. He was one of the supporting characters in the life of King David, especially in the complicated struggle for the throne among David’s sons.

British special forces in North Africa, 1943.
Benaiah, son of Jehoiada
Benaiah was not mere hired muscle, however. He was a prominent and trusted member of David’s court and went on to serve under David’s son, King Solomon. One of David’s son’s, Adonijah, started a rebellion by declaring himself king while his father was still alive, sparking a fierce conflict. But Benaiah, loyal to David, supported Solomon:
“Benaiah the son of Jehoiada answered the king and said, “Amen! May the Lord God of my lord the king say so too. As the Lord has been with my lord the king, even so may He be with Solomon, and make his throne greater than the throne of my lord King David.” (1 Kings/3 Kingdoms 1:36–37)

Ferrando Petri Funeskoa - Illumination of Solomon, Nathan, and Zadok - 1200
And later, all of these figures were part of the triumphal procession for Solomon’s ascent to the throne. Jonathan, one of David’s closest friends, mentions Benaiah when he is explaining to Adonijah that Solomon had ascended to the throne. He explains,
“Our lord King David has made Solomon king. The king has sent with him Zadok the priest, Nathan the prophet, Benaiah the son of Jehoiada, the Cherethites, and the Pelethites; and they have made him ride on the king’s mule. So Zadok the priest and Nathan the prophet have anointed him king at Gihon; and they have gone up from there rejoicing, so that the city is in an uproar. This is the noise that you have heard. Also Solomon sits on the throne of the kingdom” (1 Kings/3 Kingdoms 1:43-46).
After King David’s death (1 Kings/3 Kingdoms 2:10), Solomon ascended to the throne but was willing to give Adonijah a second chance because they were half-brothers. Unfortunately, as soon as Adonijah made the slightest act that could be interpreted as a bid for the throne, Solomon cut him off. The book of Kings (or Kingdoms) recorded what happened next: “‘Now therefore, as the Lord lives, who has confirmed me and set me on the throne of David my father, and who has established a house for me, as He promised, Adonijah shall be put to death today!’ So King Solomon sent by the hand of Benaiah the son of Jehoiada; and he struck him down, and he died” (1 Kings/3 Kingdoms 2:24-25). Solomon assigned this important task to Benaiah, who was still a trusted and high-ranking member of the house of David.

Giovanni Carlone - Bathsheba, the mother of Solomon, intercedes with her son on behalf of Adonijah - 1687
Where does he kill a lion?
Benaiah appears throughout the books chronicling the reign of David, but the main passage that lists his achievements is 2 Samuel / 2 Kingdoms 23:20-23:
“Benaiah was the son of Jehoiada, the son of a valiant man from Kabzeel, who had done many deeds. He had killed two lion-like heroes of Moab. He also had gone down and killed a lion in the midst of a pit on a snowy day. And he killed an Egyptian, a spectacular man. The Egyptian had a spear in his hand; so he went down to him with a staff, wrested the spear out of the Egyptian’s hand, and killed him with his own spear.” (2 Samuel/2 Kingdoms 23:20-21)

Antoine-Louis Barye - Walking Lion - 1840s
Benaiah meaning
Benaiah is a common Hebrew name (בניה) which means “Yahweh builds up.” Because the name was so common, there are a variety of other Benaiahs listed in the text. Some of these include the father of Pelatiah from Ezekiel’s prophetic vision (Ezek 11:1, 13), several Levites mentioned in Chronicles (2 Chron. 20-14, 2 Chron. 31:12), and even (confusingly) another of David’s mighty men (1 Chron. 11:31, 1 Chron 27:14, and 2 Samuel/2 Kingdoms 23:30).
How did Benaiah die?
Like most people listed in the adventures of the Old Testament, Benaiah’s full life story was not given to us. Though he was an important and valuable member of David’s inner circle and played a role in critical events of the time, Benaiah was not the focus of these chronicles, so his death was not recorded in the Old Testament.
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