The word(s) "keep" appears 94 time(s) in 90 verse(s) in Quran in Mohsin Khan translation.

(51) "So fear Allah, keep your duty to Him, and obey me.

(52) And We saved those who believed, and used to fear Allah, and keep their duty to Him.

(53) And when he arrived at the water (a well) of Madyan (Midian) he found there a group of men watering (their flocks), and besides them he found two women who were keeping back (their flocks). He said: "What is the matter with you?" They said: "We cannot water (our flocks) until the shepherds take (their flocks). And our father is a very old man."

(54) O mankind! Be afraid of your Lord (by keeping your duty to Him and avoiding all evil), and fear a Day when no father can avail aught for his son, nor a son avail aught for his father. Verily, the Promise of Allah is true: let not then this (worldly) present life deceive you, nor let the chief deceiver (Satan) deceive you about Allah.

(55) O Prophet (Muhammad صلى الله عليه وسلم)! keep your duty to Allah, and obey not the disbelievers and the hypocrites (i.e., do not follow their advice). Verily, Allah is Ever All-Knower, All-Wise.

(56) Allah already knows those among you who keep back (men) from fighting in Allah's Cause, and those who say to their brethren "Come here towards us," while they (themselves) come not to the battle except a little,

(57) O wives of the Prophet! You are not like any other women. If you keep your duty (to Allah), then be not soft in speech, lest he in whose heart is a disease (of hypocrisy, or evil desire for adultery) should be moved with desire, but speak in an honourable manner.

(58) And (remember) when you said to him (Zaid bin Harithah رضي الله عنه - the freed-slave of the Prophet صلى الله عليه وسلم) on whom Allah has bestowed Grace (by guiding him to Islam) and you (O Muhammad صلى الله عليه وسلم too) have done favour (by manumitting him): "keep your wife to yourself, and fear Allah." But you did hide in yourself (i.e. what Allah has already made known to you that He will give her to you in marriage) that which Allah will make manifest, you did fear the people (i.e., their saying that Muhammad صلى الله عليه وسلم married the divorced wife of his manumitted slave) whereas Allah had a better right that you should fear Him. So when Zaid had accomplished his desire from her (i.e. divorced her), We gave her to you in marriage, so that (in future) there may be no difficulty to the believers in respect of (the marriage of) the wives of their adopted sons when the latter have no desire to keep them (i.e. they have divorced them). And Allah's Command must be fulfilled.

(59) It is no sin on them (the Prophet's wives, if they appear unveiled) before their fathers, or their sons, or their brothers, or their brother's sons, or the sons of their sisters, or their own (believing) women, or their (female) slaves. And (O ladies), fear (keep your duty to) Allah. Verily, Allah is Ever All-Witness over everything.

(60) O you who believe! keep your duty to Allah and fear Him, and speak (always) the truth.