The word(s) "concern" appears 52 time(s) in 50 verse(s) in Quran in Abdullah Yusuf Ali translation.

(31) Can lead (any) into temptation concerning Allah,

(32) "What! has the Message been sent to him - (Of all persons) among us?"... but they are in doubt concerning My (Own) Message! Nay, they have not yet tasted My Punishment!

(33) Who, then, doth more wrong than one who utters a lie concerning Allah, and rejects the Truth when it comes to him; is there not in Hell an abode for blasphemers?

(34) The Day whereon they will (all) come forth: not a single thing concerning them is hidden from Allah. Whose will be the dominion that Day?" That of Allah, the One the Irresistible!

(35) "The ways and means of (reaching) the heavens, and that I may mount up to the god of Moses: But as far as I am concerned, I think (Moses) is a liar!" Thus was made alluring, in Pharaoh's eyes, the evil of his deeds, and he was hindered from the Path; and the plot of Pharaoh led to nothing but perdition (for him).

(36) Seest thou not those that dispute concerning the Signs of Allah? How are they turned away (from Reality)?-

(37) "But this thought of yours which ye did entertain concerning your Lord, hath brought you to destruction, and (now) have ye become of those utterly lost!"

(38) Ah indeed! Are they in doubt concerning the Meeting with their Lord? Ah indeed! It is He that doth encompass all things!

(39) And they became divided only after Knowledge reached them,- through selfish envy as between themselves. Had it not been for a Word that went forth before from thy Lord, (tending) to a Term appointed, the matter would have been settled between them: But truly those who have inherited the Book after them are in suspicious (disquieting) doubt concerning it.

(40) But those who dispute concerning Allah after He has been accepted,- futile is their dispute in the Sight of their Lord: on them will be a Penalty terrible.