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

(21) And this Qur'an is not such as could ever be invented in despite of Allah; but it is a confirmation of that which was before it and an exposition of that which is decreed for mankind - Therein is no doubt - from the Lord of the Worlds.

(22) And all that We relate unto thee of the story of the messengers is in order that thereby We may make firm thy heart. And herein hath come unto thee the Truth and an exhortation and a reminder for believers.

(23) In their history verily there is a lesson for men of understanding. It is no invented story but a confirmation of the existing (Scripture) and a detailed explanation of everything, and a guidance and a mercy for folk who believe.

(24) And He it is Who spread out the earth and placed therein firm hills and flowing streams, and of all fruits He placed therein two spouses (male and female). He covereth the night with the day. Lo! herein verily are portents for people who take thought.

(25) Seest thou not how Allah coineth a similitude: A goodly saying, as a goodly tree, its root set firm, its branches reaching into heaven,

(26) Allah confirmeth those who believe by a firm saying in the life of the world and in the Hereafter, and Allah sendeth wrong-doers astray. And Allah doeth what He will.

(27) And the earth have We spread out, and placed therein firm hills, and caused each seemly thing to grow therein.

(28) And He hath cast into the earth firm hills that it quake not with you, and streams and roads that ye may find a way.

(29) Make not your oaths a deceit between you, lest a foot should slip after being firmly planted and ye should taste evil forasmuch as ye debarred (men) from the way of Allah, and yours should be an awful doom.

(30) Say: The holy Spirit hath delivered it from thy Lord with truth, that it may confirm (the faith of) those who believe, and as guidance and good tidings for those who have surrendered (to Allah).