that the Messenger of Allah (ﷺ) came out to Ubayy bin Ka'b, and the Messenger of Allah (ﷺ) said: "O Ubayy!" And he was performing Salat, so Ubayy turned around but he did not respond to him, so Ubayy finished his Salat quickly. Then he turned to the Messenger of Allah (ﷺ) and said: 'As-Salamu 'Alaikum, O Messenger of Allah!' The Messenger of Allah (ﷺ) said: 'Wa 'Alaikum As-Salam - what prevented you from responding to me when I called you Ubayy?' He said: 'O Messenger of Allah! I was performing Salat.' So he said: 'Do you not find among what Allah revealed to me: Respond to Allah and to the Messenger when they call you to what gives you life?' He said: 'Of course, I shall not repeat that, if Allah wills.' He said: 'Would you like for me to teach you a Surah the likes of which has neither been revealed in the Tawrah, nor the Injil, nor the Zabur, nor in the entire Quran?' He said: "Yes, O Messenger of Allah!' The Messenger of Allah (ﷺ) said: 'What do you recite in your Salat?' He said: 'I recite Umm Al-Quran.' So the Messenger of Allah (ﷺ) said: 'By the One in Whose Hand is my soul! The like of it has neither been revealed in the Tawrah, nor the Injil nor the Zabur, nor in the Furqan. It is the seven oft-repeated, and the Magnificent Quran which I was given.'"
Jami` at-Tirmidhi Book 45, Hadith 1
Abu Bakr Siddiq wrote to him: “In the name of Allah, the Most Gracious, the Most Merciful. This is the obligation of Sadaqah which the Messenger of Allah enjoined upon the Muslims, as Allah commanded the Messenger of Allah. The ages of camels to be given (in Zakat) may be made up in sheep. So if a man has camels on which the Sadaqah is a Jadha'ah (a four-year-old she-camel) and he does not have a Jadha'ah but he has a Hiqqah (a three year old she-camel), then the Hiqqah should be accepted from him, and two sheep should be given (in addition), if they are readily available, or twenty Dirham. If a man has camels on which the Sadaqah is a Hiqqah, and he only has a Bin Labun( a two-year-old she-camel), then the Bint Labun should be accepted from him, along with two sheep or twenty Dirhams.If a man has camels on which the sadaqah is a Bint Labun, and he does not have one, but he has a Hiqqah, then it should be accepted from him, and the Zakat collector should give him back twenty Dirham or two sheep. If a man has camels on which Sadaqah is a Bint Labun, and he does not have one, but he has a Bint Makhad(a one-year-old she-camel), then the Bint Makhad should be accepted from him, along with twenty Dirham or two sheep. If a man has camels on which the Sadaqah is a Bint Makhad, and he does not have one, but he has a Bint Labun, then the Bint Labun should be accepted from him, and the Zakat collector should give him back twenty Dirhams or two sheep. Whoever does not have a Bint Makhad, but he has a Bint Labun (a two-year-old male camel), then it should be accepted from him and nothing else should be given along with it.' ”
Sunan Ibn Majah Book 8, Hadith 18
Yahya said that he heard Malik speak about someone who pledged
goods as security for a loan, and they perished with the broker. The
one who took out the loan confirmed its specification. They agreed on
the amount of the loan, but challenged each other about the value of
the pledge, the pledger saying that it had been worth twenty dinars,
whilst the broker said that it had been worth only ten, and that the
amount loaned on security was twenty dinars. Malik said, "It is said
to the one in whose hand the pledge is, 'describe it.' If he describes
it he is made to take an oath on it and then the people of experience
evaluate that description. If the value is more than what was loaned
on security for it, it is said to the broker, 'Return the rest of his
due to the pledger.' If the value is less than what was loaned on
security for it, the broker takes the rest of his due from the
pledger. If the value is the exact amount of the loan, the pledge is
compensated for by the loan."
Yahya said that he heard Malik
say, "What is done in our community about two men who have a dispute
about an amount of money loaned on the security of a pledge - the
pledger claiming that he pledged it for ten dinars and the broker
insisting that he took the pledge as security for twenty dinars, and
the pledge is clearly in the possession of the broker - is that the
broker is made to take an oath when the value of the pledge is fully
known. If the value of the pledge is exactly what he swore that he had
loaned on security for it, the broker takes the pledge as his right.
He is more entitled to take precedence with an oath since he has
possession of the pledge. If the owner of the pledge wants to give him
the amount which he swore that he was owed, he can take the pledge
back. If the pledge is worth less than the twenty dinars he loaned,
then it is said to the pledger, 'Either you give him what he has sworn
to and take your pledge back, or you swear to what you said you
pledged it for.' If the pledger takes the oath, then what the broker
has increased over the value of the pledge will become invalid. If the
pledger does not take an oath, he must pay what the broker swore to."
Malik said, "If a pledge given on security for a loan
perishes, and both parties deny each other's rights, with the broker
who is owed the loan saying that he gave twenty dinars, and the
pledger who owes the loan saying that he was given only ten, and with
the broker who is owed the loan saying the pledge was worth ten
dinars, and the broker who owes the loan saying it was worth twenty,
then the broker who is owed the loan is asked to describe the pledge.
If he describes it, he must take an oath on its description. Then
people with experience of it evaluate that description. If the value
of the pledge is estimated to be more than what the broker claims it
was, he takes an oath as to what he claimed, and the pledger is given
what is over from the value of the pledge. If its value is less than
what the broker claims of it, he is made to take an oath as to what he
claims is his. Then he demands settlement according to the actual
value of the pledge. The one who owes the loan is then made to take an
oath on the extra amount which remains owing against him to the
claimant after the price of the pledge is reached. That is because the
broker becomes a claimant against the pledger. If he takes an oath,
the rest of what the broker swore to of what he claimed above the
value of the pledge is invalidated. If he draws back, he is bound to
pay what remains due to the broker after the value of the pledge."
Muwatta Malik Book 36, Hadith 21