It is narrated from Sayyiduna Zayd bin Thabit (may Allah be pleased with him) that Sayyiduna Ali (may Allah be pleased with him) consummated his marriage with Sayyidah Fatimah (may Allah be pleased with her) before he had given her anything (of the dower).
Hadith Referenceالمعجم الكبير للطبراني / باب الزاي / 4889