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

(41) Lo! I have rewarded them this day forasmuch as they were steadfast in that they, even they, are the triumphant.

(42) We never sent before thee any messengers but lo! they verily ate food and walked in the markets. And We have appointed some of you a test for others: Will ye be steadfast? And thy Lord is ever Seer.

(43) They will be awarded the high place forasmuch as they were steadfast, and they will meet therein with welcome and the ward of peace,

(44) These will be given their reward twice over, because they are steadfast and repel evil with good, and spend of that wherewith We have provided them,

(45) But those who had been given knowledge said: Woe unto you! The reward of Allah for him who believeth and doeth right is better, and only the steadfast will obtain it.

(46) And of His signs is this: The heavens and the earth stand fast by His command, and afterward, when He calleth you, lo! from the earth ye will emerge.

(47) O my dear son! Establish worship and enjoin kindness and forbid iniquity, and persevere whatever may befall thee. Lo! that is of the steadfast heart of things.

(48) Hast thou not seen how the ships glide on the sea by Allah's grace, that He may show you of His wonders? Lo! therein indeed are portents for every steadfast, grateful (heart).

(49) And when they became steadfast and believed firmly in Our revelations, We appointed from among them leaders who guided by Our command.

(50) Lo! men who surrender unto Allah, and women who surrender, and men who believe and women who believe, and men who obey and women who obey, and men who speak the truth and women who speak the truth, and men who persevere (in righteousness) and women who persevere, and men who are humble and women who are humble, and men who give alms and women who give alms, and men who fast and women who fast, and men who guard their modesty and women who guard (their modesty), and men who remember Allah much and women who remember - Allah hath prepared for them forgiveness and a vast reward.