Maymun bin Mihran says that Ibn Abbas (may Allah be pleased with them both) was asked about a woman or a man who died owing Ramadan and a vow of a month's fasting. Ibn Abbas (may Allah be pleased with them both) said: A poor person is to be fed on his behalf for each day, or his guardian should fast on his behalf for his vow.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8220