The word(s) "main" appears 42 time(s) in 40 verse(s) in Quran in Abdullah Yusuf Ali translation.

(31) And if any strive (with might and main), they do so for their own souls: for Allah is free of all needs from all creation.

(32) In order that thou mayest admonish a people, whose fathers had received no admonition, and who therefore remain heedless (of the Signs of Allah).

(33) And if it had been Our Will, We could have transformed them (to remain) in their places; then should they have been unable to move about, nor could they have returned (after error).

(34) He would certainly have remained inside the Fish till the Day of Resurrection.

(35) And the leader among them go away (impatiently), (saying), "Walk ye away, and remain constant to your gods! For this is truly a thing designed (against you)!

(36) We certainly gave Moses the Book aforetime: but disputes arose therein. Had it not been for a Word that went forth before from thy Lord, (their differences) would have been settled between them: but they remained in suspicious disquieting doubt thereon.

(37) The same religion has He established for you as that which He enjoined on Noah - the which We have sent by inspiration to thee - and that which We enjoined on Abraham, Moses, and Jesus: Namely, that ye should remain steadfast in religion, and make no divisions therein: to those who worship other things than Allah, hard is the (way) to which thou callest them. Allah chooses to Himself those whom He pleases, and guides to Himself those who turn (to Him).

(38) Verily those who say, "Our Lord is Allah," and remain firm (on that Path),- on them shall be no fear, nor shall they grieve.

(39) Those who remain steadfast to their prayer;

(40) (And Allah's Message is): "If they (the Pagans) had (only) remained on the (right) Way, We should certainly have bestowed on them Rain in abundance.