Sayyiduna Abu Ayyub al-Ansari (may Allah be pleased with him) said: We used to sacrifice a single sheep, which a man would slaughter on behalf of himself and his household; then later people began to vie with one another in boasting, and it became a matter of pride and show.
Hadith Referenceالمعجم الكبير للطبراني / باب الخاء / 3904