عَيْنًۭا يَشْرَبُ بِهَا ٱلْمُقَرَّبُونَ ۝٢٨ What is the subject of يَشْرَبُ?

Surah Al-Mutaffifin — Part 4

• عَيْنًا
• ٱلْمُقَرَّبُونَ
• Attached هَا
• An implied singular pronoun