Ata al-Khurasani narrates from Ibn Abbas (may Allah be pleased with him) that a man came to the Prophet (peace and blessings be upon him) and said: I vowed to sacrifice a camel, but I do not have one. So he (peace and blessings be upon him) said: "Slaughter seven goats in its place."
Abu Dawud placed it in al-Marasil, because Ata al-Khurasani did not meet Ibn Abbas; and it has also been narrated as mawquf.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9792