Al-Kāfi - Volume 5 > Marriage with Kurds and Sudan
Hadith #1

1- عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ هَارُونَ بْنِ مُسْلِمٍ عَنْ مَسْعَدَةَ بْنِ زِيَادٍ عَنْ أَبِي عَبْدِ اللهِ (عَلَيْهِ السَّلام) قَالَ قَالَ أَمِيرُ الْمُؤْمِنِينَ (عَلَيْهِ السَّلام) إِيَّاكُمْ وَنِكَاحَ الزِّنْجِ فَإِنَّهُ خَلْقٌ مُشَوَّهٌ.

1. Ali has narrated from Harun ibn Muslim from Mas’adah ibn Ziyad who has said the following: “Abu ‘ Abd Allah, ‘Alayhi al-Salam, has said that ’Amir al-Mu’minin has said, ’You must remain on your guard against marriage with people of al-Zanj because it is a distorted creature.’”