وَاعْبُدُوا اللَّهَ وَلَا تُشْرِكُوا بِهِ شَيْئًا. (al-Nisāʾ 4:36)
Worship Allah, and do not associate anything with Him.
Waʿbudū Allāh is the command to worship Allah. Wa-lā tushrikū bihi shayʾā prohibits associating anything with Him.
Two obligations are joined together: worship Allah and do not associate a partner with Him in that worship.