It is narrated from Hazrat Anas (may Allah be pleased with him) that Hazrat Abdur Rahman bin Auf (may Allah be pleased with him) married an Ansari woman for a gold piece equal to a date stone, and the Prophet (peace and blessings be upon him) declared it permissible.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 13962