It is narrated from the father of Abu al-Ushara' al-Darimi (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) was asked about the 'atirah (a sacrifice offered in Rajab), and he (peace and blessings be upon him) declared it good.
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6692