Abu Bakr bin Muhammad bin Amr bin Hazm (may Allah have mercy on him) said: In the letter that the Prophet (peace and blessings be upon him) wrote to the people of Yemen, it also said: "For the spine there is blood money as well."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الديات / 16302
Ibn al-Musayyib (may Allah have mercy on him) said: The Sunnah has been established regarding blood money, and for the spine there is blood money as well.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الديات / 16303
Al-Zuhri (may Allah have mercy on him) said: It reached us from the Prophet (peace and blessings be upon him): "For the spine, the blood money is 100 camels."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الديات / 16304