The word(s) "concern" appears 46 time(s) in 43 verse(s) in Quran in Mohsin Khan translation.

(21) Then, on the Day of Resurrection, He will disgrace them and will say: "Where are My (so called) partners concerning whom you used to disagree and dispute (with the believers, by defying and disobeying Allah)?" Those who have been given the knowledge (about the Torment of Allah for the disbelievers) will say: "Verily! Disgrace and misery this Day are upon the disbelievers.

(22) And say not concerning that which your tongues put forth falsely: "This is lawful and this is forbidden," so as to invent lies against Allah. Verily, those who invent lies against Allah will never prosper.

(23) The Sabbath was only prescribed for those who differed concerning it, and verily, your Lord will judge between them on the Day of Resurrection about that wherein they used to differ.

(24) And they ask you (O Muhammad صلى الله عليه و سلم) concerning the Ruh (the Spirit); Say: "The Ruh (the Spirit) is one of the things, the knowledge of which is only with my Lord. And of knowledge, you (mankind) have been given only a little."

(25) And they ask you concerning the mountains: say, "My Lord will blast them and scatter them as particles of dust.

(26) And among mankind is he who disputes concerning Allah, without knowledge, and follows every rebellious (disobedient to Allah) Shaitan (devil) (devoid of every kind of good).

(27) Who created the heavens and the earth and all that is between them in six Days. Then He (Istawa ) rose over the Throne (in a manner that suits His Majesty). The Most Gracious (Allah)! Ask Him (O Prophet Muhammad صلى الله عليه وسلم , concerning His Qualities: His rising over His Throne, His creations, etc.), as He is Al-Khabir (The All-Knower of everything i.e. Allah).

(28) Verily, your Lord will judge between them, on the Day of Resurrection, concerning that wherein they used to differ.

(29) Call them (adopted sons) by (the names of) their fathers: that is more just with Allah. But if you know not their father's (names, call them) your brothers in faith and Mawalikum (your freed slaves). And there is no sin on you concerning that in which you made a mistake , except in regard to what your hearts deliberately intend. And Allah is Ever Oft-Forgiving, Most Merciful.

(30) People ask you concerning the Hour, say: "The knowledge of it is with Allah only. What do you know? It may be that the Hour is near!"