Nahj al-Balāgha

Hadith 1897
governance
۳۳۶. وَقَالَ (عليه ‏السلام): الْمَسْؤُولُ حُرُّ حَتَّى يَعِدَ.
336. Amīr al-mu’minīn, peace be upon him, said: The person who is approached with a request is free until he promises.
Source: al-Sharīf al-Raḍī