Ordinary Fasting means abstaining from food, drink and sexual satisfaction.
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 Allah, 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.
"Five things break a man's Fast: lying, backbiting, gossiping, perjury and a lustful gaze."
"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!"'
"The backbiter and his listener are copartners in sin."
"How many of those who Fast get nothing from it but hunger and thirst!"