Musnad Ahmad 1220:0

Narrated to us by Muhammad ibn Ja’far, who said: Narrated to us Shu’bah, from Qatadah, from Salamah bint al-Hurr, that she asked the Messenger of Allah (ﷺ) about the sacrifice (udhiyah). He said: "It is a Sunnah and an obligation." She said: "And what about the one who does not have a sacrifice?" He said: "He should not approach our prayer place."