It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) forbade the sale of madamin (the sperm in the loins of male animals), malaqih (the foetuses in the wombs of females) and habal al-habalah (the offspring of the unborn offspring of a she-camel).
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11532