It is related from Al Barái bin ʿAzib that, 'Verily the Apostle of God was asked what (animals) were unfit for sacrifice. Then he made a sign with his hand and said, "There are four: the lame whose lameness is clearly perceived, the blind whose blindness is. manifest, the sick whose disease is manifest, and those very emaciated which are not without blemish."'—Málik, Aḥmad, At Tirmidhí.
It is related from ʿÁyesha that she said, 'The Apostle of God said, " The sons of Adam have done no action on the day of sacrifice more pleasing to God than the shedding of blood, and verily it will come on the day of resurrection with its horns and its hairs and its hoofs, and verily the blood will be accepted of God before it falls to the ground. Therefore rejoice in it."'—At Tirmidhí, Ibn Májah.
It is related from Zaid bin Arqam that he said, 'The companions of the Apostle of God said, "O Apostle of God, what are these sacrifices?" He replied, "They are the practice of your father Abraham." They said, "And what benefit do we derive from them, O Apostle of God?" He replied, "There is benefit in every hair." They said, "And what if it be wool, O Apostle of God?" He replied, "There is benefit in every hair of the wool."'—Aḥmad, Ibn Májah.
On Prayers at Eclipses
It is related from Abú Músá that he said, 'There was an eclipse of the sun, and the Prophet rose up in terror, fearing that the hour (of resurrection) was coming. And he came to the mosque and prayed standing and bowing and prostrating himself a long time such as I never saw him do before. And he said, "These signs which God sends are not on account of the death or life of any one; but God frightens His servants therewith. Therefore when ye see any such, flee for refuge by remembering Him and calling upon Him and asking pardon of Him."'—Muslim, Al Bukhárí.
It is related from Jábir that he said, 'There was an eclipse of the sun in the time of the Apostle of God on the day on which Abraham, the son of the Apostle of God, died. And he prayed with the people in six rakʿahs and with four prostrations.'—Muslim.
