Al-Ahnaf bin Qays (may Allah have mercy on him) said that Sayyiduna Umar and Sayyiduna Ali (may Allah be pleased with them both) said: When the door is closed and the curtain is let down, the full dower (mahr) must be paid, and the waiting period ('iddah) is also upon the woman.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصداق / 14482