Man Lā Yaḥḍuruh al-Faqīh
Hadith 3794008 - وَ سَأَلَ سَمَاعَةُ أَبَا عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ : عَنْ بَيْعِ اَلْحَيَوَانِ اِثْنَيْنِ بِوَاحِدٍ - فَقَالَ "إِذَا سَمَّيْتَ اَلسِّنَّ فَلاَ بَأْسَ".
Hadith.4008 - Sama'ah asked Abu Abdullah (as) about selling two animals for one.
Imam (as) said: "If you specify their age, then there is no harm."