وَلَآ أَنتُمْ عَـٰبِدُونَ مَآ أَعْبُدُ ۝٥ What role does مَآ begin after عَـٰبِدُونَ?

Surah Al-Kafirun — Part 1

• The object expression
• The subject
• A conjunction
• A vocative