Absalom invited his half brother Amnon to a feast and, after getting him drunk, instructed his servants to kill him. For what reason did Absalom take this action?

Absalom killed his half brother Amnon for the ra pe of his sister.

Explanation:

Absalom was one of the sons of King David. In the Bible, the book of 2 Samuel verse 13 tells the background story of how Amnon, another son of David had fallen in love with Tamar, the sister of Absalom, also the son of David. It is worth remembering that King David had a lot of wives and concubines, as was normal for Kings during those times. Amnon wanted Tamar to be with him. When one day, he devised a plan to get Tamar, he asked his adviser Jonadab on how to approach. He advised him to pretend to be sick and request Tamar to take care of him.

Eventually, Amnon asked the king for Tamar to feed him while he's sick. When she came, he ra ped her. Tamar then ran to her brother, crying loudly on the way. When Absalom came to know of it, he was filled with rage. He thought of taking revenge for the disgrace of his sister. So, after two years had passed, he invited Amnon and the rest of the king's sons for a feast making him drunk. Then he ordered his men to kill all of them. This was in revenge for the unlawful ra pe of Tamar by Amnon.