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

(31) And the earth-- We have spread it forth and made in it firm mountains and caused to grow in it of every suitable thing.

(32) The Beneficent Allah is firm in power.

(33) Then We made him a small seed in a firm resting-place,

(34) And when you are firmly seated, you and those with you, in the ark, say: All praise is due to Allah who delivered us from the unjust people:

(35) Who created the heavens and the earth and what is between them in six periods, and He is firmly established on the throne of authority; the Beneficent Allah, so ask respecting it one aware.

(36) Those against whom the sentence has become confirmed will say: Our Lord! these are they whom we caused to err; we caused them to err as we ourselves did err; to Thee we declare ourselves to be clear (of them); they never served Us.

(37) And whoever submits himself wholly to Allah and he is the doer of good (to others), he indeed has taken hold of the firmest thing upon which one can lay hold; and Allah's is the end of affairs.

(38) Then ask them whether they are stronger in creation or those (others) whom We have created. Surely We created them of firm clay.

(39) Or do they say: He has forged a lie against Allah? But if Allah pleased, He would seal your heart; and Allah will blot out the falsehood and confirm the truth with His words; surely He is Cognizant of what is in the breasts.

(40) That you may firmly sit on their backs, then remember the favor of your Lord when you are firmly seated thereon, and say: Glory be to Him Who made this subservient to us and we were not able to do it