"I heard the Messenger of Allah say" - and he gestured with his fingers, but his fingers were shorter than the fingers of the Messenger of Allah - he said "It is not permissible to offer as a sacrifice an animal that clearly has one bad eye, a lame animal that is obviously lame, as sick animal that is obviously sick, or an animals that is so emaciated that it is as if there is no marrow in its bones." (Using translation from Nasāʾī 4371)  

سَمِعْتُ رَسُولَ اللهِ ﷺ وَأَشَارَ بِأَصَابِعِهِ وَأَصَابِعِي أَقْصَرُ مِنْ أَصَابِعِ رَسُولِ اللهِ ﷺ وَهُوَ يُشِيرُ بِإِصْبُعِهِ وَيَقُولُ لَا يَجُوزُ مِنَ الضَّحَايَا الْعَوْرَاءُ الْبَيِّنُ عَوَرُهَا وَالْعَرْجَاءُ الْبَيِّنُ عَرَجُهَا وَالْمَرِيضَةُ الْبَيِّنُ مَرَضُهَا وَالْعَجْفَاءُ الَّتِي لَا تُنْقِي