Sunan an-Nasa'i 4215
سنن النسائي#4215Sahihأَخْبَرَنَا أَحْمَدُ بْنُ سُلَيْمَانَ، قَالَ حَدَّثَنَا عَفَّانُ، قَالَ حَدَّثَنَا حَمَّادٌ، عَنْ قَيْسِ بْنِ سَعْدٍ، عَنْ عَطَاءٍ، وَطَاوُسٍ، وَمُجَاهِدٍ، عَنْ أُمِّ كُرْزٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " فِي الْغُلاَمِ شَاتَانِ مُكَافَأَتَانِ وَفِي الْجَارِيَةِ شَاةٌ " .
it was narrated from Um Kurz that the Messenger of Allah said:"for a boy two sheep, Mukafaatan (of equal age), and for a girl, one sheep
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih
In-book reference: 40:4