I'll go first. Verse of the Qur'an:
[qs:2:183]
and a hadith taken from here:
Sahih Bukhari :: Book# 31 :: Hadith# 115
Narrated Talha bin ‘Ubaid-Ullah: A bedouin with unkempt hair came to Allah’s Apostle and said, “O Allah’s Apostle! Inform me what Allah has made compulsory for me as regards the prayers.” He replied: “You have to offer perfectly the five compulsory prayers in a day and night (24 hours), unless you want to pray Nawafil.” The bedouin further asked, “Inform me what Allah has made compulsory for me as regards fasting.” He replied, “You have to fast during the whole month of Ramadan, unless you want to fast more as Nawafil.” The bedouin further asked, “Tell me how much Zakat Allah has enjoined on me.” Thus, Allah’s Apostle informed him about all the rules (i.e. fundamentals) of Islam. The bedouin then said, “By Him Who has honored you, I will neither perform any Nawafil nor will I decrease what Allah has enjoined on me. Allah’s Apostle said, “If he is saying the truth, he will succeed (or he will be granted Paradise).”
In another hadith,the Messenger of Allah (may Allah bless him and grant him peace) says,"Ramadan has come to you. (It is) a month of blessing, in which Allah covers you with blessing, for He sends down Mercy, decreases sins and answers prayers. In it, Allah looks at your competition (in good deeds), and boasts about you to His angels. So show Allah goodness from yourselves, for the unfortunate one is he who is deprived in (thismonth) of the mercy of Allah, the Mighty, the Exalted." [Narrated byTabarani]
"How many people find fault in what they're reading and the fault is in their own understanding" Al Mutanabbi