At-Tur (The Mount)

42. Or do they intend to employ some stratagem to efface the truth? But those who disbelieve are themselves plotted against!

The blessed Verse in question is asking if their denial stems from plotting, stratagem, and vanity that they intend to plot against the Noble Prophet (S)? But they are unaware that their stratagems will be used against themselves, since Divine Stratagems are far superior to theirs and they shall pay dearly for their plots.

If they imagine that they may be triumphant over the Noble Prophet (S) by getting together at Dar al-Nadwa, a town hall in Mecca at the time of the Noble Prophet (S), and plotting against him and falsely accusing him of soothsaying, madness, poetry, and the like, they are mistaken since His Omnipotence is superior to all powers and He guaranteed the safety, salvation, and triumph of His Messenger (S) in propagating his universal Call.