Sayyiduna Jabir bin Abdullah (may Allah be pleased with them both) said that the Messenger of Allah (peace and blessings be upon him) said: "Women should be married only to their equals, only their guardians should marry them off, and the mahr should not be less than ten dirhams."
This hadith is extremely weak. Ali (al-Daraqutni) (may Allah have mercy on him) said: Mubashshir bin Ubayd is matruk al-hadith (abandoned in hadith); his hadiths are not corroborated. Baqiyyah also narrated it from Mubashshir, from al-Hajjaj, from Abu al-Zubayr, from Jabir, and it is weak; no proof is established by the like of it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 13760