Sunan an-Nasa'i, Hadith 4217 ⓘ
It was narrated that umm Kurz said: "I came to the Prophet and asked him about the sacrificial meat. I heard him say: 'For a boy, two sheep, and for a girl, one sheep, and it does not matter if they are male or female."'
أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ عُبَيْدِ اللَّهِ، - وَهُوَ ابْنُ أَبِي يَزِيدَ - عَنْ سِبَاعِ بْنِ ثَابِتٍ، عَنْ أُمِّ كُرْزٍ، قَالَتْ أَتَيْتُ النَّبِيَّ صلى الله عليه وسلم بِالْحُدَيْبِيَةِ أَسْأَلُهُ عَنْ لُحُومِ الْهَدْىِ فَسَمِعْتُهُ يَقُولُ " عَلَى الْغُلاَمِ شَاتَانِ وَعَلَى الْجَارِيَةِ شَاةٌ لاَ يَضُرُّكُمْ ذُكْرَانًا كُنَّ أَمْ إِنَاثًا " .
also referenced under: Book 40, Hadith 6 (In-Book) & Volume 5, Book 40, Hadith 4222 (DarusSalam)