The word(s) "firm" appears 59 time(s) in 56 verse(s) in Quran in Muhammad Pickthal translation.

(31) And if We had not made thee wholly firm thou mightest almost have inclined unto them a little.

(32) And say: My Lord! Cause me to come in with a firm incoming and to go out with a firm outgoing. And give me from Thy presence a sustaining Power.

(33) And We made firm their hearts when they stood forth and said: Our Lord is the Lord of the heavens and the earth. We cry unto no Allah beside Him, for then should we utter an enormity.

(34) He said: My Lord! How can I have a son when my wife is barren and I have reached infirm old age?

(35) Confirm my strength with him

(36) And We have placed in the earth firm hills lest it quake with them, and We have placed therein ravines as roads that haply they may find their way.

(37) And those who, when they spend, are neither prodigal nor grudging; and there is ever a firm station between the two;

(38) Is not He (best) Who made the earth a fixed abode, and placed rivers in the folds thereof, and placed firm hills therein, and hath set a barrier between the two seas? Is there any Allah beside Allah? Nay, but most of them know not!

(39) My brother Aaron is more eloquent than me in speech. Therefor send him with me as a helper to confirm me. Lo! I fear that they will give the lie to me.

(40) He hath created the heavens without supports that ye can see, and hath cast into the earth firm hills, so that it quake not with you; and He hath dispersed therein all kinds of beasts. And We send down water from the sky and We cause (plants) of every goodly kind to grow therein.