Psalms 141:5 Let the righteous smite me; it shall be a kindness: and let him reprove me; it shall be an excellent oil, which shall not break my head: for yet my prayer also shall be in their calamities.
When the righteous rebukes (As noted by Keil & Delitzsch: God is just an attribute here, not an appellation), it is not out of hatred but love, and should be treated as such by both parties.
It is the best ointment.
Of course, the last part, "...their calamities.", I shall not render it as John Gill's "the distress of the righteous", but John Calvin and Keil & Delitzsch's "the sins/temptations of the wicked". As one is not tempted or affected by them and even praying compassion for them in the end.