The phrase "so that his left hand does not know what his right hand gives" is not merely a poetic metaphor; it is a strict legal parameter for ideal charity. While public charity is permissible (and sometimes encouraged, such as when donating to inspire others), the default ruling for the most virtuous charity is concealment. This prevents the giver from falling into Riya (showing off in worship), which invalidates the spiritual reward of the deed.
By concluding with "even the prick of a thorn," the Prophet (peace be upon him) emphasizes that no suffering is too trivial in the sight of Allah. This inclusion dismantles any notion that only great calamities carry spiritual weight. It elevates every moment of discomfort—physical, emotional, or psychological—into an opportunity for spiritual purification. Umdah Al-ahkam Vol. 3 Hadith No. 460
After verifying across multiple classical and contemporary prints (e.g., Dar al-Fikr, Dar Ibn al-Jawzi editions), Hadith No. 460 corresponds to the following narration: The phrase "so that his left hand does