To Abu Musa Ashaari, the governor of Kufa, when Ali learned that he discouraged jihad

Nahj al-Balāgha|Volume 1|Book 2|Chapter 63

Book 2, Chapter 63

مِنْ عَبْدِ اللهِ عَلِيٍّ أَمِيرِ الْمُؤْمِنِينَ إِلَى عَبْدِ اللهِ بْنِ قَيْسٍ.

From the servant of Allāh, Amīr al-mu’minīn to ‘Abdullāh ibn Qays: