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

(11) And their saying was no other than that they said: Our Lord! forgive us our faults and our extravagance in our affair and make firm our feet and help us against the unbelieving people.

(12) And how can you take it when one of you has already gone in to the other and they have made with you a firm covenant?

(13) And We lifted the mountain (Sainai) over them at (the taking of the covenant) and We said to them: Enter the door making obeisance; and We said to them: Do not exceed the limits of the Sabbath, and We made with them a firm covenant.

(14) But the firm in knowledge among them and the believers believe in what has been revealed to. you and what was revealed before you, and those who keep up prayers and those who give the poor-rate and the believers in Allah and the last day, these it is whom We will give a mighty reward.

(15) And remember the favor of Allah on you and His covenant with which He bound you firmly, when you said: We have heard and we obey, and be careful of (your duty to) Allah, surely Allah knows what is in the breasts.

(16) Surely your Lord is Allah, Who created the heavens and the earth in six periods of time, and He is firm in power; He throws the veil of night over the day, which it pursues incessantly; and (He created) the sun and the moon and the stars, made subservient by His command; surely His is the creation and the command; blessed is Allah, the Lord of the worlds.

(17) And when Musa came at Our appointed time and his Lord spoke to him, he said: My Lord! show me (Thyself), so that I may look upon Thee. He said: You cannot (bear to) see Me but look at the mountain, if it remains firm in its place, then will you see Me; but when his Lord manifested His glory to the mountain He made it crumble and Musa fell down in a swoon; then when he recovered, he said: Glory be to Thee, I turn to Thee, and I am the first of the believers.

(18) And We ordained for him in the tablets admonition of every kind and clear explanation of all things; so take hold of them with firmness and enjoin your people to take hold of what is best thereof; I will show you the abode of the transgressors.

(19) And when We shook the mountain over them as if it were a covering overhead, and they thought that it was going to fall down upon them: Take hold of what We have given you with firmness, and be mindful of what is in it, so that you may guard (against evil).

(20) When your Lord revealed to the angels: I am with you, therefore make firm those who believe. I will cast terror into the hearts of those who disbelieve. Therefore strike off their heads and strike off every fingertip of them.