Special Fasting means keeping one's ears, eyes, tongue, hands and feet - and all other organs - free from sin.
Extra-special Fasting means fasting of the heart from unworthy concerns and worldly thoughts, in total disregard of everything but God, Great and Glorious is He. This kind of Fast is broken by thinking of worldly matters, except for those conducive to religious ends, since these constitute provision for the Hereafter and are not of this lower world.
Those versed in the spiritual life of the heart have even said that a sin is recorded against one who concerns himself all day with arrangements for breaking his Fast. Such anxiety stems from lack of trust in the bounty of God, Great and Glorious is He, and from lack of certain faith in His promised sustenance.
To this third degree belong the Prophets, the true awliya and the intimates of God. It does not lend itself to detailed examination in words, as its true nature is better revealed in action. It consists in utmost dedication to God, Great and Glorious is He, to the neglect of everything other than God, Exalted is He. It is bound up with the significance of His words: 'Say: "Allah (sent it down)": then leave them to play in their vain discussions.' [al-An'am, 6:91]
Jabir relates from Anas that God's Messenger, on him be peace, said: 'Five things break a man's Fast: lying, backbiting, gossiping, perjury and a lustful gaze.'
The Prophet, on him be peace, said: 'Fasting is a shield; so when one of you is Fasting he should not use foul or foolish talk. If someone attacks him or insults him, let him say: "I am Fasting, I am Fasting!"'
According to Tradition: 'Two women were Fasting during the time of God's Messenger, on him be peace. They were so fatigued towards the end of the day, from hunger and thirst, that they were on the verge of collapsing. They therefore sent a message to God's Messenger, on him be peace, requesting permission to break their Fast. In response, the Prophet, on him be peace, sent them a bowl and said: "Tell them to vomit into it what they have eaten." One of them vomited and half filled the bowl with fresh blood and tender meat, while the other brought up the same so that they filled it between them. The onlookers were astonished. Then the Prophet, on him be peace, said: "These two women have been Fasting from what God made lawful to them, and have broken their Fast on what God, Exalted is He, made unlawful to them. They sat together and indulged in backbiting, and here is the flesh of the people they maligned!"'
God, Great and Glorious is He, also said: 'Why do their rabbis and priests not forbid them to utter sin and consume unlawful profit?' [al-Ma'idah 5:63]
Silence in the face of backbiting is therefore unlawful. God, Exalted is He, said: 'You are then just like them.' [al-Nisa 4:140] That is why the Prophet, on him be peace, said: 'The backbiter and his listener are co-partners in sin.'
The spirit and secret nature of Fasting is to weaken the forces which are Satan's means of leading us back to evil. It is therefore essential to cut down one's intake to what one would consume on a normal night, when not Fasting. No benefit is derived from the Fast if one consumes as much as one would usually take during the day and night combined. Moreover, one of the properties consists in taking little sleep during the daytime, so that one feels the hunger and thirst and becomes conscious of the weakening of one's powers, with the consequent purification of the heart.
One should let a certain degree of weakness carry over into the night, making it easier to perform the (tahajjud) and to recite the praises (awrad). It may then be that Satan will not hover around one's heart, and that one will behold the Kingdom of Heaven. The Night of Destiny represents the night on which something of this Kingdom is revealed. This is what is meant by the words of God, Exalted is He:'We surely revealed it on the Night of Power.' [al-Qadr 97:1]
Anyone who puts a bag of food between his heart and his breast becomes blind to this revelation. Nor is keeping the stomach empty sufficient to remove the veil, unless one also empties the mind of everything but God, Great and Glorious is He. That is the entire matter, and the starting point of it all is cutting down on food.
It is related of al-Hasan ibn Abil Hasan al-Basri that he once passed by a group of people who were laughing merrily. He said: 'God, Great and Glorious is He, has made the month of Ramadan a racecourse, on which His creatures compete in His worship. Some have come in first and won, while others have lagged behind and lost. It is absolutely amazing to find anybody laughing and playing about on the day when success attends the victors, and failure the wasters. By God, if the veil were lifted off, the doer of good would surely be preoccupied with his good works and the evildoer with his evil deeds.' In too full of joy to indulge in idle sport, while for one who has suffered rejection laughter will be precluded by remorse.
Of al-Ahnaf ibn Qays it is reported that he was once told: 'You are an aged elder; Fasting would enfeeble you.' But he replied: 'By this I am making ready for a long journey, Obedience to God, Glorified is He, is easier to endure than His punishment.'
Such are the inwardly significant meanings of Fasting.