Volume 3, Book 38, Number 499: Narrated Abu Said Al-Khudri and Abu Huraira:

Allah's Apostle employed someone as a governor at Khaibar. When the man came to Medina, he brought with him dates called Janib. The Prophet asked him, "Are all the dates of Khaibar of this kind?" The man replied, "(No), we exchange two Sa's of bad dates for one Sa of this kind of dates (i.e. Janib), or exchange three Sa's for two." On that, the Prophet said, "Don't do so, as it is a kind of usury (Riba) but sell the dates of inferior quality for money, and then buy Janib with the money". The Prophet said the same thing about dates sold by weight. (See Hadith No. 506).


Volume 3, Book 38, Number 501: Narrated Abu Huraira:

The Prophet owed somebody a camel of a certain age. When he came to demand it back, the Prophet said (to some people), "Give him (his due)." When the people searched for a camel of that age, they found none, but found a camel one year older. The Prophet said, "Give (it to) him." On that, the man remarked, "You have given me my right in full. May Allah give you in full." The Prophet said, "The best amongst you is the one who pays the rights of others generously."


Volume 3, Book 38, Number 502: Narrated Abu Huraira:

A man came to the Prophet demanding his debts and behaved rudely. The companions of the Prophet intended to harm him, but Allah's Apostle said (to them), "Leave him, for the creditor (i.e. owner of a right) has the right to speak." Allah's Apostle then said, "Give him a camel of the same age as that of his." The people said, "O Allah's Apostle! There is only a camel that is older than his." Allah's Apostle said, "Give (it to) him, for the best amongst you is he who pays the rights of others handsomely."


Friday Prayer

Volume 2, Book 13, Number 1: Narrated Abu Huraira:

I heard Allah's Apostle (p.b.u.h) saying, "We (Muslims) are the last (to come) but (will be) the foremost on the Day of Resurrection though the former nations were given the Holy Scriptures before us. And this was their day (Friday) the celebration of which was made compulsory for them but they differed about it. So Allah gave us the guidance for it (Friday) and all the other people are behind us in this respect: the Jews' (holy day is) tomorrow (i.e. Saturday) and the Christians' (is) the day after tomorrow (i.e. Sunday)."

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A Man Would Do Nothing,
If He Waited Until He
Could Do It So Well
That No One Would Find Fault
With What He Has Done.