Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) states: On the day of sacrifice, two piebald rams (with more white) were brought to the Prophet (peace and blessings be upon him). After that the narrator mentioned that the Prophet (peace and blessings be upon him) said about one of the two: "This is on behalf of Muhammad and his household," and said about the other: "This is on behalf of every member of my Ummah who is unable to offer sacrifice." (Allamah Haythami says:) I say: In the "Sunan" this narration is transmitted from this Companion: "The Prophet (peace and blessings be upon him) sacrificed a horned, fat ram."
Al-Bazzar recorded it, and this wording is his; Ahmad recorded it in abridged form, and its narrators are thiqat (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الأضاحي / 5970