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

(71) And (as for) those of your women who have despaired of menstruation, if you have a doubt, their prescribed time shall be three months, and of those too who have not had their courses; and (as for) the pregnant women, their prescribed time is that they lay down their burden; and whoever is careful of (his duty to) Allah He will make easy for him his affair.

(72) That is the command of Allah which He has revealed to you, and whoever is careful of (his duty to) Allah, He will remove from him his evil and give him a big reward.

(73) Allah has prepared for them severe chastisement, therefore be careful of (your duty to) Allah, O men of understanding who believe! Allah has indeed revealed to you a reminder,

(74) That you should serve Allah and be careful of (your duty to) Him and obey me: