The word(s) "fast" appears 74 time(s) in 64 verse(s) in Quran in Muhammad Pickthal translation.

(61) And verily We shall try you till We know those of you who strive hard (for the cause of Allah) and the steadfast, and till We test your record.

(62) And he who findeth not (the wherewithal), let him fast for two successive months before they touch one another; and for him who is unable to do so (the penance is) the feeding of sixty needy ones. This, that ye may put trust in Allah and His messenger. Such are the limits (imposed by Allah); and for disbelievers is a painful doom.

(63) It may happen that his Lord, if he divorce you, will give him in your stead wives better than you, submissive (to Allah), believing, pious, penitent, devout, inclined to fasting, widows and maids.

(64) And He made fast the hills,