Alqamah (may Allah have mercy on him) said: A woman came with her husband to Sayyiduna Umar (may Allah be pleased with him) and said: O Commander of the Believers! My husband divorced me, then my bleeding stopped after three menstrual periods. He came to me when I had set out my water (for the ritual bath), closed my door and taken off my clothes, and he said: I have taken you back, I have taken you back. Thereupon Sayyiduna Umar (may Allah be pleased with him) asked Sayyiduna Ibn Mas'ud (may Allah be pleased with him): What is your view about this? He said: "My view is that she is (still) his wife until the prayer becomes lawful for her." Sayyiduna Umar (may Allah be pleased with him) said: "That is my view too."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9581