ʿAmr b. ʿAwn > Ḥammād b. Zayd > ʿUbaydullāh b. Abū Yazīd > Sibāʿ b. Thābit > Um Kurz

The Messenger of Allah ﷺ said: Two sheep which resemble each other are to be sacrificed for a boy and one for a girl. Abu Dawud said: This is a sound tradition, and the tradition narrated by Sufyan is misunderstanding. – Sound Chain

حَدَّثَنَا عَمْرُو بْنُ عَوْنٍ حَدَّثَنَا حَمَّادُ بْنُ زَيْدٍ عَنْ عُبَيْدِ اللَّهِ بْنِ أَبِي يَزِيدَ عَنْ سِبَاعِ بْنِ ثَابِتٍ عَنْ أُمِّ كُرْزٍ قَالَتْ

قَالَ رَسُولُ اللَّهِ ﷺ «عَنِ الْغُلَامِ شَاتَانِ مِثْلَانِ وَعَنِ الْجَارِيَةِ شَاةٌ» – إسناده صحيح