The corresponding letter to this chapter is Ayin- spiritual insight.
Sh’mu’el Bet 16:1-2 Now when David had passed a little beyond the summit, look, Tziva the servant of M’fivoshet met him with a couple of saddled donkeys, and on them were two hundred loaves of bread, a hundred clusters of raisins, a hundred summer fruits, and a jug of wine. And the king said to Tziva, "Why do you have these?" And Tziva said, "The donkeys are for the king's household to ride, and the bread and summer fruit for the young men to eat, and the wine, for whoever is faint in the wilderness to drink."
M’fivoshet was sending David supplies to support him and his entourage while they were on the run. It was a gift and he was attempting to repay the kindness that David had shone him.
Sh’mu’el Bet 16:3-4 Then the king said, "And where is your master's son?" And Tziva said to the king, "Look, he is staying in Yerushalayim, for he said, 'Today the house of Israel will restore the kingdom of my father to me.'" So the king said to Tziva, "Look, all that belongs to M’fivoshet is yours." And Tziva said, "I prostrate myself; let me find favor in your sight, O my lord, the king!"
Tziva lied to David and told him that M’fivoshet was hoping to have the kingdom of Sha’ul his grandfather restored to him. This was not true. David did not chack out this story but acted rashly and stripped M’fivoshet of everything that he has and gave it to this lier.
Sh’mu’el Bet 16:5-14 When King David came to Bachurim, look, there came out from there a man of the family of the house of Saul whose name was Shim’i, the son of Gera; he came out cursing continually as he came. And he threw stones at David and at all the servants of King David; and all the people and all the mighty men were at his right hand and at his left. And thus Shim’i said when he cursed, "Get out, get out, you man of bloodshed, and worthless fellow! "The L-RD has returned upon you all the bloodshed of the house of Saul, in whose place you have reigned; and the L-RD has given the kingdom into the hand of your son Avshalom. And look, you are taken in your own evil, for you are a man of bloodshed!" Then Avishai the son of Tz’ruyah said to the king, "Why should this dead dog curse my lord the king? Let me go over now, and cut off his head." But the king said, "What have I to do with you, O sons of Tz’ruyah? If he curses, and if the L-RD has told him, 'Curse David,' then who shall say, 'Why have you done so?'" Then David said to Avishai and to all his servants, "Look, my son who came out from me seeks my life; how much more now this Binyamini? Let him alone and let him curse, for the L-RD has told him. Perhaps the L-RD will look on my affliction and return good to me instead of his cursing this day." So David and his men went on the way; and Shim’i went along on the hillside parallel with him and as he went he cursed, and cast stones and threw dust at him. And the king and all the people who were with him arrived weary and he refreshed himself there.
Now David is heckled by some relative of Sha’uls, David put the matter into the L-rd’s hands and did not retaliate.
Sh’mu’el Bet 16:15-19 Then Avshalom and all the people, the men of Israel, entered Yerushalayim, and Achitofel with him. Now it came about when Hushai the Arki, David's friend, came to Avshalom, that Hushai said to Avshalom, "Long live the king! Long live the king!" And Avshalom said to Hushai, "Is this your loyalty to your friend? Why did you not go with your friend?" Then Hushai said to Avshalom, "No! For whom the L-RD, this people, and all the men of Israel have chosen, his will I be, and with him I will remain. And besides, whom should I serve? Should I not serve in the presence of his son? As I have served in your father's presence, so I will be in your presence."
Now that David has abdicated the throne Avshalom returns to Yerushalayim and begins to setup his kingdom.
Remember Hushai is working for David and acting as a spy for David. He is there to give Avshalom bad advice too.
Sh’mu’el Bet 16:20-23 Then Avshalom said to Achitofel, "Give your advice. What shall we do?" And Achitofel said to Avshalom, "Go in to your father's concubines, whom he has left to keep the house; then all Israel will hear that you have made yourself odious to your father. The hands of all who are with you will also be strengthened." So they pitched a tent for Avshalom on the roof, and Avshalom went in to his father's concubines in the sight of all Israel. And the advice of Achitofel, which he gave in those days, was as if one inquired of the word of G-d; so was all the advice of Achitofel regarded by both David and Avshalom.
The L-rd G-d said this would happen because of David’s sin with Bat-Sheva which he had done in secret. He also said the sin against him would be in the sight of all Israel.