Hadith record

13. Ali ibn Ibrahim has narrated from his father from Hammad from Hariz from Muhammad ibn Muslim who has said the following: “Abu Ja‘far (a.s.), once asked, ‘Do you know why mahr (dower) of women has become four thousand?’ I replied, ‘No, I do not know.’ He (the Imam) said, “Umm Habibah, daughter of abu Sufyan was in al-Habashah (Ethiopia) and the Holy Prophet, O Allah, grant compensation to Muhammad and his family worthy of their services to Your cause, proposed marriage. Al-Najashiy paid four thousand. For this reason they take it, however, the actual mahr (dower) is twelve Awqiyah and one Nashsha.’”

Translation: Muhammad Sarwar·Thaqalayn link·The Arabic above is the original.