Hadithcore
Mishkat al-Masabih, 1468

Abu Huraira said he heard God’s Messenger say, "A lamb is a good sacrifice.” Tirmidhi transmitted it.

وَعَنْ أَبِي هُرَيْرَةَ قَالَ: سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقُولُ: «نِعْمَتِ الْأُضْحِيَّةُ الْجذع من الضَّأْن» . رَوَاهُ التِّرْمِذِيّ

References1 variant
In-Book Reference
Book 4, Hadith 869