أَيُّهَا السَّادِرُ فِي غَلْوَائِهِ
O you who continue heedlessly in your reckless excess!
Al-sādir describes someone proceeding without due awareness. Al-ghalwāʾ suggests excessive impetuosity or transgression. The speaker addresses a type of person rather than naming one particular individual.
Ayyuhā is a form of direct address; it arrests the listener’s attention before the warning unfolds.