Chapter on the Reward of Suhoor
Man Lā Yaḥḍuruh al-Faqīh|Volume 2|Book 2|Chapter 22
وَ سَأَلَ رَجُلٌ اَلصَّادِقَ عَلَيْهِ اَلسَّلاَمُ فَقَالَ: آكُلُ وَ أَنَا أَشُكُّ فِي اَلْفَجْرِ فَقَالَ «كُلْ حَتَّى لاَ تَشُكَّ».
A man asked Imam Jafar ibn Muhammad Al-Sadiq عليه السلام, "I eat while I am unsure if dawn has risen." Imam عليه السلام replied: "Eat until you are no longer in doubt."
- Ṣaḥīḥ al-Faqīh