• The Prophet (PBUH) says, “The first thing created by Allah was the pen, then, He ordered it to write, so it wrote everything that will happen till the Day of Judgment.” (narrated by At-Tirmidhi, Abu-Dawud, and Ahmad)
   
• BROTHER IN LAW, IS DEATH.
  Sayyiduna Uqbah ibn Aamir (Radhiallaahu Anhu) reports that Rasulullah (Sallallaahu Alayhi Wasallam) said, ?Beware of mixing with women.? An Ansari Sahaabi enquired, ?Oh Rasulullah (Sallallaahu Alayhi Wasallam), what about the brother-in-law?? At this, Rasulullah (Sallallaahu Alayhi Wasallam) replied, ?The brother-in-law is death!? (Sahih Bukhari Hadith5232; Sahih Muslim Hadith5638)

• 5 THINGS ONLY ALLAH KNOWS.
  The Prophet said, "The keys of the unseen are five and none knows them but Allah: (1) None knows what is in the womb, but Allah: (2) None knows what will happen tomorrow, but Allah; (3) None knows when it will rain, but Allah; (4) None knows where he will die, but Allah (knows that); (5) and none knows when the Hour will be established, but Allah." Bukhari, Volume 9, Book 93, Number 476

• The Messenger of Allaah (peace and blessings of Allaah be upon him) said: “The eyes commit zina and their zina is by looking…” then he said, “… and the private part confirms that or denies it.” Narrated by al-Bukhaari, 6612; Muslim, 2657
• THE DIFFRENCE BTWEEN A MUSLIM AND A KAFIR IS SALAH
  The difference between a man (Muslim) and shirk and kufr is the abandoning of salaah.(Sahih Muslim: Kitab ul Iman: Book 001, Number 0147)

• WHOEVER RELIEVES A BELIEVER OF SOME OF THE DISTRESS OF THIS WORLD
  “Whoever relieves a believer of some of the distress of this world, Allaah willrelievehim of some of the distress of the Day of Resurrection. Whoevermakesthings easier for one who is suffering hardship, Allaah will make things easier for him in this world and in the Hereafter. Whoever conceals a Muslim’s faults, Allaah will conceal his faults in this world and in the Hereafter. Allaah will help a person so long as he helps his brother.” (Narrated by Muslim, 4/2074).
• FIGHT THE LEADERS IF YOU SEE CLEAR KUFFR
  1.      We entered upon 'Ubada bin As-Samit while he was sick. We said, "May Allah make you healthy. Will you tell us a Hadith you heard from the Prophet and by which Allah may make you benefit?" He said, "The Prophet called us and we gave him the Pledge of allegiance for Islam, and among the conditions on which he took the Pledge from us, was that we were to listen and obey (the orders) both at the time when we were active and at the time when we were tired, and at our difficult time and at our ease and to be obedient to the ruler and give him his right even if he did not give us our right, and not to fight against him unless we noticed him having open Kufr (disbelief) for which we would have a proof with us from Allah."Volume 9, Book 88, Number 178 , Bukhari.

2.     Umm Salamah (May Allah be pleased with her) reported: The Prophet (PBUH) said, "You will have rulers some of whom you approve and some of whom you will disapprove. He who dislikes them will be safe, and he who expresses disapproval will be safe, but he who is pleased and follows them (will be indeed sinful)". His audience asked: "Shall we not fight them?'' He replied, "No, as long as they establish Salat amongst you".[Muslim].

• "You see the believers as regards their being merciful among themselves and showing love among themselves and being kind, resembling one body, so that, if any part of the body is not well then the whole body shares the sleeplessness (insomnia) and fever with it."Volume 8, Book 73, Number 40,Bukhari.

• (Whoever intentionally lies upon me, let him find his seat in the Hellfire), [Bukhaaree V.1/107]. 

• ZAKAT.
  1.      Allah's Apostle said, "Whoever is made wealthy by Allah and does not pay the Zakat of his wealth, then on the Day of Resurrection his wealth will be made like a bald-headed poisonous male snake with two black spots over the eyes. The snake will encircle his neck and bite his cheeks and say, 'I am your wealth, I am your treasure.'bukhari Volume 2, Book 24, Number 486.
  
  2.     "A people do not keep from giving the zakah on their wealth except that they will be kept from having rain from the sky. If it were not for the animals, it would not rain at all". (Ibn Maajah, according to al-Albaani it is sahih, see Silsilat al-Hadeeth as-Saheehah, vol.1, hadith no. 106)