Musannaf Ibn Abi Shaybah

Hazrat Ibn Ma'qil (may Allah have mercy on him) and Hazrat Sha'bi (may Allah have mercy on him) say that if a man gives one divorce to his wife, then another man meets him and asks, "Have you divorced your wife?" He replies, "Yes, I have divorced her." Then another man meets him and asks the same question, and the man replies, "Yes, I have divorced her." If, while answering them, he intended the first divorce, then only one divorce will be counted.