Hasan al-Basri and Ibrahim al-Nakha'i, may Allah have mercy on them, said: If a man divorces his wife and says, "I have divorced you," then says the same to another, then the intention will be considered. If the intention was for the first statement, then only one divorce will occur.
Hadith Referenceسنن سعید بن منصور / كتاب الطلاق / 2351
Hadith Takhrij«أخرجه سعيد بن منصور فى «سننه» ترقيم الدرالسلفية برقم:، 1174، وابن أبى شيبة فى «مصنفه» برقم: 18180»