The word(s) "whether" appears 38 time(s) in 34 verse(s) in Quran in Muhammad Pickthal translation.

(21) They said: It is all one to us whether thou preachest or art not of those who preach;

(22) (Solomon) said: We shall see whether thou speakest truth or whether thou art of the liars.

(23) One with whom was knowledge of the Scripture said: I will bring it thee before thy gaze returneth unto thee. And when he saw it set in his presence, (Solomon) said: This is of the bounty of my Lord, that He may try me whether I give thanks or am ungrateful. Whosoever giveth thanks he only giveth thanks for (the good of) his own soul; and whosoever is ungrateful (is ungrateful only to his own soul's hurt). For lo! my Lord is Absolute in independence, Bountiful.

(24) He said: Disguise her throne for her that we may see whether she will go aright or be of those not rightly guided.

(25) whether ye divulge a thing or keep it hidden, lo! Allah is ever Knower of all things.

(26) whether thou warn them or thou warn them not, it is alike for them, for they believe not.

(27) Whoso doeth an ill-deed, he will be repaid the like thereof, while whoso doeth right, whether male or female, and is a believer, (all) such will enter the Garden, where they will be nourished without stint.

(28) Then have patience (O Muhammad). Lo! the promise of Allah is true. And whether we let thee see a part of that which We promise them, or (whether) We cause thee to die, still unto Us they will be brought back.

(29) Endure the heat thereof, and whether ye are patient of it or impatient of it is all one for you. Ye are only being paid for what ye used to do.

(30) whether thou ask forgiveness for them or ask not forgiveness for them is all one for them; Allah will not forgive them. Lo! Allah guideth not the evil-living folk.