Hadith
حَدَّثَنَا أَحْمَدُ بْنُ مُحَمَّدِ بْنِ ثَابِتٍ، حَدَّثَنَا عَلِيُّ بْنُ الْحُسَيْنِ، حَدَّثَنِي أَبِي، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ بُرَيْدَةَ، قَالَ سَمِعْتُ أَبِي بُرَيْدَةَ، يَقُولُ كُنَّا فِي الْجَاهِلِيَّةِ إِذَا وُلِدَ لأَحَدِنَا غُلاَمٌ ذَبَحَ شَاةً وَلَطَخَ رَأْسَهُ بِدَمِهَا فَلَمَّا جَاءَ اللَّهُ بِالإِسْلاَمِ كُنَّا نَذْبَحُ شَاةً وَنَحْلِقُ رَأْسَهُ وَنَلْطَخُهُ بِزَعْفَرَانٍ .
Narrated Buraydah ibn al-Hasib: When a boy was born to one of us in the pre-Islamic period, we sacrificed a sheep and smeared his head with its blood; but when Allah brought Islam, we sacrificed a sheep, shaved his head and smeared his head with saffron
Sahih · Al-Albani
Sunan Abi Dawud 2843 ·Book 16, Hadith 56·Also available on sunnah.com·