It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) forbade al-majr.
Abu Ubayd (may Allah have mercy on him) said that Abu Zayd (may Allah have mercy on him) said: Al-majr is that a camel or another animal is sold in exchange for what is in the belly of the she-camel.
This hadith with this wording was narrated only by Musa bin Ubaydah; Yahya bin Ma'in said: This was held against Musa, and it was among the reasons for his being declared weak.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10864
Hadith Gradingمحدثین:منكر
Hadith Takhrij«منكر۔ اخرجه البزار كما في مجمع الزوائد 3/ 16»