Sawm: Fasting
Introduction
The noble Prophet 
  Muhammad (s.a.w.) gave an impressive sermon welcoming the month of Ramadhãn. 
  He said:
“O people! The 
  month of Allãh with its blessings, mercy and forgiveness has come upon 
  you. It is the most preferred of all the months with Allãh; its days 
  are the best of days, its nights are the best of nights, and its hours are the 
  best of hours. It is a month in which you have been invited as guests of Allãh 
  and have been placed among those honoured by Allãh. Your breathing in 
  it is [like] an act of praising [Allãh], your sleep an act of worship; 
  your good deeds are accepted, and your prayers answered. Therefore, ask Allãh 
  with sincere intentions and pure hearts to help you in fasting and recitating 
  His Book during this [month]. Indeed damned is he who is deprived of Allãh’s 
  forgiveness during this august month.
“O people! The 
  gates of  Paradise are wide open 
  during this month; therefore, ask your Lord not to close them in your face and 
  the gates of Hell-Fire are locked; therefore, ask your Lord not to open them 
  for you. Satans are chained; therefore, ask your Lord not to unfetter them upon 
  you.
“O people! Whosoever 
  among you improves his character during this month, he shall have the pass [to 
  cross] over the Bridge (sirãt) on the day when [people’s] feet 
  shall slip. Whosoever is lenient with his slaves during this month, Allãh 
  will be lenient with him in the reckoning of his [deeds on the Day of Judgement]. 
  Whosoever checks his evil deeds during this month, Allãh shall withhold 
  His anger from him on the day he meets Him. Whosoever honours an orphan during 
  this month, Allãh shall honour him on the day he meets Him. Whosoever 
  maintains, during this month, contact with his relations, Allãh will 
  maintain His mercy for him on the day he meets Him. Whosoever recites a verse 
  from the Qur’ãn during this month, his reward will be like one who has 
  completed the recitation of the Qur’ãn during the other months.”
 Imam ‘Ali (a.s.) said, “There are some who fast 
  but will gain nothing from their fasting except thirst; and there are some who 
  pray but will gain nothing from their prayer except tiredness.”
Imam as-Sãdiq (a.s.) said, “When you fast, your ears, eyes, hair, skin, and all your limbs should also fast.” He also said, “Fasting is not only [abstaining] from food and drink alone. When you fast, protect your tongue from lying; lower your eye-glances from what Allãh has forbidden [you to see]; do not fight with one another; do not be jealous of one another; do not backbite one another; do not abuse one another; and do not be unjust to one another. Refrain from false accusation, lying, fighting, suspicion, backbiting, and slandering. Be those who look forward to the hereafter, and wait for your days, waiting for what Allãh has promised for those who have prepared to meet Allãh. You must have tranquility, sobriety, humility, servility, and submissiveness of a slave who fears his master; and be fearful [of Allãh’s chastisement] as well as hopeful [in His forgiveness].”*
* For these and other similar ahadith in the books of hadith and in Mafatihu 'l-Jinan of 'Abbas al-Qummi, p. 235-237.