مِشْكَاةُ الْمَصَابِيحِ
Mishkat al-Masabih 3987
Jihad
The Division of Spoils and Dishonesty regarding them - Section 1
وَعَنِ ابْنِ عُمَرَ: أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَسْهَمَ لِلرَّجُلِ وَلِفَرَسِهِ ثَلَاثَةَ أَسْهُمٍ: سَهْمًا لَهُ وَسَهْمَيْنِ لِفَرَسِهِ
Ibn ‘Umar told that God’s Messenger allotted three portions for a man and his horse, one for him and two for his horse. (Bukhari and Muslim.)
Mishkat al-Masabih, 3987مُتَّفَقٌ عَلَيْهِ (الألباني)