What is the meaning of "Yehelmeni Tzadik Chesed v'Yochicheni"?
Rashi: It is good for me that a true Navi rebuke and afflict me, for all his blows and rebuke are Chesed.
Radak: Delicacies [of Resha'im] are not pleasant to me, but if a Tzadik hits me and rebukes me, it is pleasant to me; I consider it Chesed.
Malbim: There it is written that David's men enticed him to kill Sha'ul, and David cut the corner of Sha'ul's robe, and his heart pained him that he did so. They said that Hashem brought him to David's hand to kill him, for he is a Rodef; Sha'ul's kingship finished, and David's kingship arrived. David was unsure. He tested this via cutting his garment. Disgracing his royal garment is like rebellion. His heart pained him, for a Shalem's heart pains him if he does a bad act. David inferred that Sha'ul is still king. The Chesed and disgrace that I did to Sha'ul, to disgrace his garments, it hits me - since I am a Tzadik, my heart pains me - and proves to me that he is still Mashi'ach Hashem.
What is the meaning of "Shemen Rosh Al Yani Roshi"?
Rashi: The oil of kingship that was poured on my head - "Dishanta va'Shemen Roshi" (23:5), do not remove it from My head due to the Tzadik's rebuke, to go to combat evildoers.
Radak: The one who hits me will not break my head. It will be considered like good oil used to anoint wounds. "Shemen Rosh" is [esteemed,] like "Besamim Rosh" (Shemos 30:23).
Radak citing his father: if a Tzadik hits me and rebukes me, it is good for me and Chesed for me. If a Rasha anoints me with esteemed oil, I will scream 'do not break my head'!
Malbim: Sha'ul is still Mashi'ach Hashem; the oil used to anoint him did not leave its Kedushah. The oil used to anoint me does not annul his oil.
Why does it say "Ki Od"?
Rashi: As long as my Tefilah is in my mouth, it is due to the evil of evildoers, that I not stumble in it.
Radak: As long as I am [alive], my Tefilah is to be saved from Resha'im's evil deeds. How can their delicacies be pleasant to me?!
Malbim: Even though he pursues me to kill me, I already saw Hashem's Hashgachah to remove his evil from me. At Sela ha'Machlekos, Sha'ul and his men surrounded David, and a messenger told Sha'ul that Pelishtim spread over Yisrael. This was Hashgachah, especially according to the opinion that an angel told him. I saw that when I prayed to be saved from their evil, Hashem sent His help before I finished praying.
