Amir al-mu'minīn's nocturnal reflections on asceticism
Nahj al-Balāgha|Volume 1|Book 3|Chapter 104
قال السيد الرضى: وَقَدْ قِيلَ أَيْضاً إِنَّ الْعَرْطَبَةَ الطَّبْلُ وَالْكَوْبَةَ الطُّنْبُورُ.
As-Sayyid ar-Raḍī says: It is also said that “‘arṭabah” means ‘ṭabl’ (drum) and “kūbah’’ means ‘lute’.