Ikrimah narrates from Abdullah bin Abbas (may Allah be pleased with them both), attributing it to the Prophet, that he (peace and blessings be upon him) said: "The sacrifice has been made obligatory upon me, but it has not been made obligatory upon you." Al-Asbahani added in his narration: "I have been commanded to offer the forenoon (duha) prayer, but you have not been commanded to do so." [Weak]
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19031