Sahih Bukhari
Virtues and Merits of the Prophet (pbuh) and his Companions
Volume: 004 / Book Number: 056 / Hadith Number: 726
Narrated Ibn 'Abbas:
If you wish to know about the ignorance of the Arabs, refer to Surat-al-Anam after Verse No. 130:--Indeed lost are those who have killed their children From folly without knowledge and have forbidden that which Allah has provided for them, inventing a lie against Allah. They have indeed gone astray and were not guided.' (6.14)