ENOfficial
He said, "God’s Messenger forbade us to sacrifice an animal with a broken horn or a slit ear.” Ibn Majah transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَنْ عَلِيٍّ قَالَ: نَهَى رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَن نضحي بأعضب الْقرن وَالْأُذن. رَوَاهُ ابْن مَاجَه
sunnah.com