Sayyiduna Abu Hurayrah (may Allah be pleased with him) says: He should fast the Ramadan that is present, make up the other, and feed a poor person for each day.
Ibn Jurayj narrates from Ata that Sayyiduna Abu Hurayrah (may Allah be pleased with him) said: One mudd of wheat for each poor person.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8212