Sahih
Muslim
صحيح مسلم
35
The Book of Sacrifices
كتاب الأضاحى
Chapter 2: The age of sacrificial animals
باب سِنِّ الأُضْحِيَةِ
Sahih Muslim 1963
Jabir reported Allah's Messenger (ﷺ) as saying
Sacrifice only a grown-up animal, unless it is difficult for you, in which case sacrifice a ram (of even less than a year, but more than six months' age).حَدَّثَنَا أَحْمَدُ بْنُ يُونُسَ، حَدَّثَنَا زُهَيْرٌ، حَدَّثَنَا أَبُو الزُّبَيْرِ، عَنْ جَابِرٍ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " لاَ تَذْبَحُوا إِلاَّ مُسِنَّةً إِلاَّ أَنْ يَعْسُرَ عَلَيْكُمْ فَتَذْبَحُوا جَذَعَةً مِنَ الضَّأْنِ " .
Grade: Sahih