The word(s) "wherein" appears 38 time(s) in 37 verse(s) in Quran in Mohsin Khan translation.

(31) And gave them clear proofs in matters [by revealing to them the Taurat (Torah)]. And they differed not until after the knowledge came to them, through envy among themselves. Verily, Your Lord will judge between them on the Day of Resurrection about that wherein they used to differ.

(32) Then, when they saw it as a dense cloud coming towards their valleys, they said: "This is a cloud bringing us rain!" Nay, but it is that (torment) which you were asking to be hastened - a wind wherein is a painful torment!

(33) And indeed there has come to them news (in this Qur'an) wherein there is (enough warning) to check (them from evil),

(34) wherein both will be Qasirat-ut-Tarf [chaste females (wives) restraining their glances, desiring none except their husbands], with whom no man or jinni has had tamth before them.

(35) Indeed We have sent Our Messengers with clear proofs, and revealed with them the Scripture and the Balance (justice) that mankind may keep up justice. And We brought forth iron wherein is mighty power (in matters of war ), as well as many benefits for mankind, that Allah may test who it is that will help Him (His religion) and His Messengers in the unseen. Verily, Allah is All-Strong, All-Mighty.

(36) Or have you a Book wherein you learn,

(37) wherein are correct and straight laws from Allah.