The word(s) "concerning" appears 43 time(s) in 40 verse(s) in Quran in Mohsin Khan translation.

(21) 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."

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

(23) 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).

(24) 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).

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

(26) 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.

(27) 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!"

(28) Surely the religion (i.e. the worship and the obedience) is for Allah only. And those who take Auliya' (protectors, helpers, lords, gods) besides Him (say): "We worship them only that they may bring us near to Allah." Verily Allah will judge between them concerning that wherein they differ. Truly, Allah guides not him who is a liar, and a disbeliever.

(29) Verily they are in doubt concerning the Meeting with their Lord? (i.e. Resurrection after their death, and their return to their Lord). Verily! He it is Who is surrounding all things!

(30) And they divided not till after knowledge had come to them, through (selfish) transgression between themselves. And had it not been for a Word that went forth before from your Lord for an appointed term, the matter would have been settled between them. And verily, those who were made to inherit the Scripture [i.e. the Taurah (Torah) and the Injeel (Gospel)] after them (i.e. Jews and Christians) are in grave doubt concerning it (i.e. Allah's true religion - Islam or the Qur'an).