Sayyiduna Ubayd bin Nadlah (may Allah be pleased with him) narrates: The Prophet (peace and blessings be upon him) forbade (the sale of) the offspring of the offspring. He said (or the narrator says): On what is in the belly of the she-camel.
Al-Tabarani recorded it in al-Mu'jam al-Kabir, and
it is mursal, and its narrators are the narrators of the Sahih.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب البيوع / 6504