The word(s) "firm" appears 53 time(s) in 50 verse(s) in Quran in Muhammad Habib Shakir translation.

(41) O you who believe! if you help (the cause of) Allah, He will help you and make firm your feet.

(42) Muhammad is the Apostle of Allah, and those with him are firm of heart against the unbelievers, compassionate among themselves; you will see them bowing down, prostrating themselves, seeking grace from Allah and pleasure; their marks are in their faces because of the effect of prostration; that is their description in the Taurat and their description in the Injeel; like as seed-produce that puts forth its sprout, then strengthens it, so it becomes stout and stands firmly on its stem, delighting the sowers that He may enrage the unbelievers on account of them; Allah has promised those among them who believe and do good, forgiveness and a great reward.

(43) He it is who created the heavens and the earth in six periods, and He is firm in power; He knows that which goes deep down into the earth and that which comes forth out of it, and that which comes down from the heaven and that which goes up into it, and He is with you wherever you are; and Allah sees what you do.

(44) Surely Allah loves those who fight in His way in ranks as if they were a firm and compact wall.

(45) Or have you received from Us an agreement confirmed by an oath extending to the day of resurrection that you shall surely have what you demand?

(46) And I do bear with them, surely My plan is firm.

(47) Surely the rising by night is the firmest way to tread and the best corrective of speech.

(48) We created them and made firm their make, and when We please We will bring in their place the likes of them by a change.

(49) And the mountains, He made them firm,

(50) And the mountains, how they are firmly fixed,