Nahj al-Balāgha
Hadith 1862٢٩٠. وَقَالَ (عليه السلام): لَوْ لَمْ يَتَوَعَّدِ اللهُ عَلَى مَعْصِيَةٍ لَكَانَ يَجِبُ أَنْ لَّا يُعْصَى شُكْراً لِنِعَمِهِ.
290. Amīr al-mu’minīn, peace be upon him, said: Even if Allāh had not warned of chastisement on those disobedient to Him, it would be obligatory by way of gratefulness for His favours that He should not be disobeyed.