It is narrated from Ibn Umar (may Allah be pleased with them both) that he used to say: Every divorced woman is entitled to maintenance upon divorce, except for the one whose dowry has been specified and then she is divorced before consummation; for her, only the specified dowry will be counted.
Hadith Referenceمسند الإمام الشافعي / كتاب الطلاق / 1273