Sahih Bukhari Book: 65, Hadith: 4871

حَدَّثَنَا يَحْيَى، حَدَّثَنَا وَكِيعٌ، عَنِ الأَعْمَشِ، عَنْ أَبِي الضُّحَى، عَنْ مَسْرُوقٍ، قَالَ دَخَلْتُ عَلَى عَبْدِ اللَّهِ فَقَالَ إِنَّ مِنَ الْعِلْمِ أَنْ تَقُولَ لِمَا لاَ تَعْلَمُ اللَّهُ أَعْلَمُ، إِنَّ اللَّهَ قَالَ لِنَبِيِّهِ صلى الله عليه وسلم ‏{‏قُلْ مَا أَسْأَلُكُمْ عَلَيْهِ مِنْ أَجْرٍ وَمَا أَنَا مِنَ الْمُتَكَلِّفِينَ‏}‏ Narrated `Abdullah: It is a sign of having knowledge that, when you do not know something, you say: ‘Allah knows better.’ Allah said to his Prophet: ‘Say: No wage do I ask of you for this (Qur’an), nor am I one of the pretenders (a person who pretends things which do not exist)’ (38.86) When the Quraish troubled and stood against the Prophet he said, “O Allah! Help me against them by afflicting them with seven years of famine like the seven years of Joseph.” So they were stricken with a year of famine during which they ate bones and dead animals because of too much suffering, and one of them would see someth...