The word(s) "serve" appears 100 time(s) in 96 verse(s) in Quran in Muhammad Pickthal translation.

(71) As for that which We inspire in thee of the Scripture, it is the Truth confirming that which was (revealed) before it. Lo! Allah is indeed Observer, Seer of His slaves.

(72) If Allah took mankind to task by that which they deserve, He would not leave a living creature on the surface of the earth; but He reprieveth them unto an appointed term, and when their term cometh - then verily (they will know that) Allah is ever Seer of His slaves.

(73) For what cause should I not serve Him Who hath created me, and unto Whom ye will be brought back?

(74) Say: O My bondmen who believe! Observe your duty to your Lord. For those who do good in this world there is good, and Allah's earth is spacious. Verily the steadfast will be paid their wages without stint.

(75) Say (O Muhammad, to the disbelievers): Do ye bid me serve other than Allah? O ye fools!

(76) Nay, but Allah must thou serve, and be among the thankful!

(77) A day when ye will turn to flee, having no preserver from Allah: and he whom Allah sendeth astray, for him there is no guide.

(78) And make mention (O Muhammad) of the brother of A'ad when he warned his folk among the wind-curved sandhills - and verily warners came and went before and after him - saying: serve none but Allah. Lo! I fear for you the doom of a tremendous Day.

(79) The believers are naught else than brothers. Therefore make peace between your brethren and observe your duty to Allah that haply ye may obtain mercy.

(80) Have they not then observed the sky above them, how We have constructed it and beautified it, and how there are no rifts therein?