The word(s) "fast" appears 39 time(s) in 30 verse(s) in Quran in Mohsin Khan translation.

(11) Allah will not punish you for what is unintentional in your oaths, but He will punish you for your deliberate oaths; for its expiation feed ten Masakin (poor persons), on a scale of the average of that with which you feed your own families, or clothe them or manumit a slave. But whosoever cannot afford (that), then he should fast for three days. That is the expiation for the oaths when you have sworn . And protect your oaths (i.e. do not swear much) . Thus Allah make clear to you His Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) that you may be grateful.

(12) O you who believe! Kill not the game while you are in a state of Ihram [for Hajj or 'Umrah (pilgrimage)], and whosoever of you kills it intentionally, the penalty is an offering, brought to the Ka'bah, of an eatable animal (i.e. sheep, goat, cow) equivalent to the one he killed, as adjudged by two just men among you; or, for expiation, he should feed Masakin (poor persons), or its equivalent in Saum (fasting), that he may taste the heaviness (punishment) of his deed. Allah has forgiven what is past, but whosoever commits it again, Allah will take retribution from him. And Allah is All-Mighty, All-Able of Retribution.

(13) And as to those who hold fast to the Book (i.e. act on its teachings) and perform As-Salat (Iqamat-as-Salat ), certainly We shall never waste the reward of those who do righteous deeds.

(14) O Prophet (Muhammad صلى الله عليه وسلم)! Urge the believers to fight. If there are twenty steadfast persons amongst you, they will overcome two hundreds, and if there be a hundred steadfast persons they will overcome a thousand of those who disbelieve, because they (the disbelievers) are people who do not understand.

(15) Now Allah has lightened your (task), for He knows that there is weakness in you. So if there are of you a hundred steadfast persons, they shall overcome two hundreds, and if there are a thousand of you, they shall overcome two thousand with the Leave of Allah. And Allah is with As-Sabirun (the patient).

(16) (The believers whose lives Allah has purchased are) those who turn to Allah in repentance (from polytheism and hypocrisy, etc.), who worship (Him), who praise (Him), who fast (or go out in Allah's Cause), who bow down (in prayer), who prostrate themselves (in prayer), who enjoin (on people) Al-Ma'ruf (i.e. Islamic Monotheism and all what Islam has ordained) and forbid (people) from Al-Munkar (i.e. disbelief, polytheism of all kinds and all that Islam has forbidden), and who observe the limits set by Allah (do all that Allah has ordained and abstain from all kinds of sins and evil deeds which Allah has forbidden). And give glad tidings to the believers.

(17) And We have fastened every man's deeds to his neck, and on the Day of Resurrection, We shall bring out for him a book which he will find wide open.

(18) (It was said to his son): "O Yahya (John)! Hold fast the Scripture [the Taurat (Torah)]." And We gave him wisdom while yet a child.

(19) "So eat and drink and be glad. And if you see any human being, say: 'Verily! I have vowed a fast unto the Most Gracious (Allah) so I shall not speak to any human being this day.'"

(20) [Musa (Moses)] said: "Nay, throw you (first)!" Then behold! their ropes and their sticks, by their magic, appeared to him as though they moved fast.