Hadith 4:201
Ibn Fudayl narrated to us, from al-A’mash, from Muslim ibn Sabih, who said: A man came to Ibn Abbas and said to him, "When should I stop the suhur (pre-dawn meal)?" A man sitting next to him said, "Eat until you are in doubt, then stop." Ibn Abbas said, "Eat as long as you are in doubt, until you are no longer in doubt."
حدثنا بن فضيل عن الأعمش عن مسلم بن صبيح قال جاء رجل إلى بن عباس فقال له متى ادع السحور فقال رجل جالس عنده كل حتى إذا شككت فدعه فقال كل ما شككت حتى لا تشك