The word(s) "concern" appears 154 time(s) in 144 verse(s) in Quran in Muhammad Pickthal translation.

(61) Their messengers said: Can there be doubt concerning Allah, the Creator of the heavens and the earth? He calleth you that He may forgive you your sins and reprieve you unto an appointed term. They said: Ye are but mortals like us, who would fain turn us away from what our fathers used to worship. Then bring some clear warrant.

(62) They said: Nay, but we bring thee that concerning which they keep disputing,

(63) And they assign a portion of that which We have given them unto what they know not. By Allah! but ye will indeed be asked concerning (all) that ye used to invent.

(64) And speak not, concerning that which your own tongues qualify (as clean or unclean), the falsehood: "This is lawful, and this is forbidden," so that ye invent a lie against Allah. Lo! those who invent a lie against Allah will not succeed.

(65) The Sabbath was appointed only for those who differed concerning it, and lo! thy Lord will judge between them on the Day of Resurrection concerning that wherein they used to differ.

(66) They are asking thee concerning the Spirit. Say: The Spirit is by command of my Lord, and of knowledge ye have been vouchsafed but little.

(67) These, our people, have chosen (other) gods beside Him though they bring no clear warrant (vouchsafed) to them. And who doth greater wrong than he who inventeth a lie concerning Allah?

(68) And in like manner We disclosed them (to the people of the city) that they might know that the promise of Allah is true, and that, as for the Hour, there is no doubt concerning it. When (the people of the city) disputed of their case among themselves, they said: Build over them a building; their Lord knoweth best concerning them. Those who won their point said: We verily shall build a place of worship over them.

(69) (Some) will say: They were three, their dog the fourth, and (some) say: Five, their dog the sixth, guessing at random; and (some) say: Seven, and their dog the eighth. Say (O Muhammad): My Lord is Best Aware of their number. None knoweth them save a few. So contend not concerning them except with an outward contending, and ask not any of them to pronounce concerning them.

(70) He said: Well, if thou go with me, ask me not concerning aught till I myself make mention of it unto thee.