The word(s) "careful" appears 79 time(s) in 74 verse(s) in Quran in Muhammad Habib Shakir translation.

(51) O you who believe! be careful of (your duty to) Allah and speak the right word,

(52) As if they were eggs carefully protected.

(53) Say: O my servants who believe! be careful of (your duty to) your Lord; for those who do good in this world is good, and Allah's earth is spacious; only the patient will be paid back their reward in full without measure.

(54) They shall have coverings of fire above them and coverings beneath them; with that Allah makes His servants to fear, so be careful of (your duty to) Me, O My servants!

(55) But (as for) those who are careful of (their duty to) their Lord, they shall have high places, above them higher places, built (for them), beneath which flow rivers; (this is) the promise of Allah: Allah will not fail in (His) promise.

(56) And those who are careful of (their duty to) their Lord shall be conveyed to the garden in companies; until when they come to it, and its doors shall be opened, and the keepers of it shall say to them: Peace be on you, you shall be happy; therefore enter it to abide.

(57) And when Isa came with clear arguments he said: I have come to you indeed with wisdom, and that I may make clear to you part of what you differ in; so be careful of (your duty to) Allah and obey me:

(58) O you who believe! be not forward in the presence of Allah and His Apostle, and be careful of (your duty to) Allah; surely Allah is Hearing, Knowing.

(59) O you who believe! if an evil-doer comes to you with a report, look carefully into it, lest you harm a people in ignorance, then be sorry for what you have done.

(60) The believers are but brethren, therefore make peace between your brethren and be careful of (your duty to) Allah that mercy may be had on you.