the Messenger of Allah forbade selling the offspring of the offspring of a pregnant animal (Habal Al-Habalah), which was a transaction practiced by the people of the Jahiliyyah, whereby a man would buy camel to slaughter, but he would wait until the she-camel had produced offspring and the offspring in her belly had then produced offspring.
Reference: Sunan an-Nasa'i 4625 In-book : Book 44, Hadith 177 English translation : Vol. 5, Book 44, Hadith 4629
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