The People of Kufa complained against Sa`d to `Umar and the latter dismissed him and appointed
`Ammar as their chief . They lodged many complaints against Sa`d and even they alleged that he did
not pray properly. `Umar sent for him and said, "O Aba 'Is-haq! These people claim that you do not
pray properly." Abu 'Is-haq said, "By Allah, I used to pray with them a prayer similar to that of Allah's
Apostle and I never reduced anything of it. I used to prolong the first two rak`at of `Isha prayer and
shorten the last two rak`at." `Umar said, "O Aba 'Is-haq, this was what I thought about you." And then
he sent one or more persons with him to Kufa so as to ask the people about him. So they went there
and did not leave any mosque without asking about him. All the people praised him till they came to
the mosque of the tribe of Bani `Abs; one of the men called Usama bin Qatada with a surname of Aba
Sa`da stood up and said, "As you have put us under an oath; I am bound to tell you that Sa`d never
went himself with the army and never distributed (the war booty) equally and never did justice in legal
verdicts." (On hearing it) Sa`d said, "I pray to Allah for three things: O Allah! If this slave of yours is
a liar and got up for showing off, give him a long life, increase his poverty and put him to trials." (And
so it happened). Later on when that person was asked how he was, he used to reply that he was an old
man in trial as the result of Sa`d's curse. `Abdul Malik, the sub narrator, said that he had seen him
afterwards and his eyebrows were overhanging his eyes owing to old age and he used to tease and
assault the small girls in the way.
Sahih al-Bukhari Book 10, Hadith 149
I went to the Prophet (ﷺ) while two men who were Ash’ arIs were with me. One of them was on my right and the other on my left side. Bothe of them asked him for employment. The prophet (ﷺ) was silent. He asked : What do you say Abu Musa, or ‘Abd Allah b. Qais (Abu Musa’s name)? I replied: By him who has sent you with truth, they did not inform me of what they had in their hearts, and I did not know that they would ask for an employment. He said : I have the scene before my eyes that he had his toothstick below his lip which receded. He (the prophet) said: We will never or will not put in charge of our work anyone who asks for it. But go, ye, Abu Musa, or ‘Abd Allah b. Qais. He then sent him as a Governor of the Yemen, After him he sent Muadh b. Jabal. When Muadh came to him, he said: come down , and he put a cushion for him. He saw that a man was chained with him. He asked : What is this? He replied: He was a Jew and he accepted Islam. He then converted to his religion, an evil religion. He said: I will not sit until he is killed according to the decision of Allah and his Apostle (ﷺ). He said: Yes, be seated. He said: I will not sit until he is killed according to the decision of Allah and his Apostle (peace be upon him). He said it three times. He then commanded for it and he was killed. Both of them then discussed the question of prayer and vigilance at night. One of them, probably Muadh, said : So far as I am concerned, I sleep and I keep vigilance: I keep vigilance and I sleep: I hope for the same reward for my sleep as for my vigilance.
Sunan Abi Dawud Book 40, Hadith 4
When the Prophet (ﷺ) was checked from going to the Ka'ba, the people of Mecca made peace with him'on the condition that he would (be allowed to) enter Mecca (next year) and stay there for three days, that he would not enter (the city) except with swords in their sheaths and arms encased in their covers, that he would not take eway with him anyone from its dwellers, nor would he prevent anyone from those with him to stay on in Mecca (if he so desired). He said to 'Ali: Write down the terms settled between us. (So 'Ali wrote): In the name of Allah, most Gracious and most Merciful. This is what Muhammad, the Messenger of Allah, has settled (with the Meccans), The polytheists said to him: If we knew that thou art the Messenger of of Allah, we would follow you. But write: Muhammad b. 'Abdullah. So he told 'Ali to strike out these words. 'Ali said: No, by Allah, I will not strike them out. The Messenger of Allah (may Peace be upon him) said: Show me their place (on the parchment). So he ('Ali) showed him their place and he (the Holy Prophet) struck them out; and 'Ali wrote: Ibn 'Abdullah. (According to the terms of the treaty, next year) the Prophet (ﷺ) stayed there for three days When it was the third day, they said to 'Ali: This is the last day according to the terms of your companion. So tell him to leave. 'Ali informed the Prophet (ﷺ) accordingly. He said: Yes, and left (the city). Ibn Janab in his version of the tradition used:" we would swear allegiance to you" instead of" we would follow you".
Sahih Muslim Book 32, Hadith 113
"When my Ummah does fifteen things, the afflictions will occur in it." It was said: "What are they O Messenger of Allah?" He said: "When Al-Maghnam (the spoils of war) are distributed (preferentially), trust is usurped, Zakah is a fine, a man obeys his wife and disobeys his mother, he is kind to his friend and abandons his father, voices are raised in the Masajid, the leader of the people is the most despicable among them, the most honored man is the one whose evil the people are afraid of, intoxicants are drunk, silk is worn (by males), there is a fascination for singing slave-girls and music, and the end of this Ummah curses its beginning. When that occurs, anticipate a red wind, collapsing of the earth, and transformation."
Jami` at-Tirmidhi Book 33, Hadith 53