Sahih Bukhari Volume 4, Book 56, Hadith Number 726.

Narated By 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)