It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) said: "I had forbidden you from nabidh made in earthenware jars, and I had forbidden you from visiting graves, and I had forbidden you from (storing) the meat of sacrificial animals. Listen! Vessels neither make anything lawful nor make it unlawful. Listen! Visit the graves, for they soften the hearts." (The narrator) added in his narration: "Listen! I had forbidden you from (keeping) the meat of sacrificial animals (for more than three days); so now eat, and store as much as you wish."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13178