Yahya said that Malik said, "The position with us concerning a
man who has zakat to pay on one hundred camels but then the zakat
collector does not come to him until zakat is due for a second timeand
by that time all his camels have died except five, is that the zakat
collector assesses from the five camels the two amounts of zakat that
are due from the owner of the animals, which in this case is only two
sheep, one for each year. This is because the only zakat which an
owner of livestock has to pay is what is due from him on the day that
the zakat is (actually) assessed. His livestock may have died or it
may have increased, and the zakat collector only assesses the zakat on
what he (actually) finds on the day he makes the assessment. If more
than one payment of zakat is due from the owner of the livestock, he
still only has to pay zakat according to what the zakat collector
(actually) finds in his possession, and if his livestock has died, or
several payments of zakat are due from him and nothing is taken until
all his livestock has died, or has been reduced to an amount below
that on which he has to pay zakat, then he does not have to pay any
zakat, and there is no liability (on him) for what has died or for the
years that have passed.
Muwatta Malik Book 17, Hadith 29
I saw Abu Dhar Al-Ghifari wearing a cloak, and his slave, too, was wearing a cloak. We asked him
about that (i.e. how both were wearing similar cloaks). He replied, "Once I abused a man and he
complained of me to the Prophet (ﷺ) . The Prophet (ﷺ) asked me, 'Did you abuse him by slighting his
mother?' He added, 'Your slaves are your brethren upon whom Allah has given you authority. So, if
one has one's brethren under one's control, one should feed them with the like of what one eats and
clothe them with the like of what one wears. You should not overburden them with what they cannot
bear, and if you do so, help them (in their hard job).
Sahih al-Bukhari Book 49, Hadith 28
When the ailment of the Prophet (ﷺ) got aggravated, he became unconscious whereupon Fatima said, "Oh,
how distressed my father is!" He said, "Your father will have no more distress after today." When he
expired, she said, "O Father! Who has responded to the call of the Lord Who has invited him! O
Father, whose dwelling place is the Garden of Paradise (i.e. Al-Firdaus)! O Father! We convey this
news (of your death) to Gabriel." When he was buried, Fatima said, "O Anas! Do you feel pleased to
throw earth over Allah's Messenger (ﷺ)?"
Sahih al-Bukhari Book 64, Hadith 478
That the Messenger of Allah (ﷺ) said: "Both the buyer and the seller retain the option as long as they have not separated. If they spoke the truth and clarified (any defects or conditions), then they would be blessed in their sale, and if they hid something and lied then their sale would be deprived of blessings."
And this is a Sahih Hadith.
This is how it was reported from Abu Barzah Al-Aslami, that two men came disputing to him after the sale of a horse, and they were on a ship, so he said: "I did not see the two of your separate, and the Messenger of Allah (ﷺ) said: 'The buyer and the seller retain the choice as long as they did not separate.'"
Some of the people of knowledge, among the people of Al-Kufah and others, held the view that the separation refers to speech. This is the saying of Ath-Thawri. This has been reported from Malik bin Anas, and it has been reported from Ibn al-Mubarak that he said: "How could this be refuted ?" And the Hadith about it from the Prophet (ﷺ) is Sahih, and it strenghtens this view.
And the meaning of the saying of the Prophet (ﷺ): "Except for the optional sale" is, that (while they are still together) the seller gives the buyer the option to cancel after the conclusion of the sale. If he chooses to agree to the sale, then he does not have the choice to cancel the sale after then, even if they did not separate. This is how Ash-Shafi'i and others explained it. And what strenghtens the view of those who said that the separation refers to them parting, (and) it does not refer to speech, is the (following) Hadith of 'Abdullah bin 'Amr from the Prophet (ﷺ).
Jami` at-Tirmidhi Book 14, Hadith 46