Translation of the verse 42 from Surah AT-Tur : Number of verses 49 - - page 525 - Part 27.
Or do they intend a plot (against you O Muhammad SAW)? But those who disbelieve (in the Oneness of Allah Islamic Monotheism) are themselves in a plot!
Or do they intend a plan? But those who disbelieve - they are the object of a plan.
(52:42) Or are they contriving a stratagem against you? *33 If so, that stratagem will rebound against the unbelievers. *34
*33) The allusion is to the secret plots that the disbelievers of Makkah used to devise in their meetings in order to defeat the mission of the Holy Prophet (on whom be Allah's peace) and to kill him.
*34) This is one of the clear prophecies of the Qur'an. In the initial stage at Makkah when the Holy Prophet (on wham be Allah's peace) had no apparent power and support with him except a handful of the ill-equipped Muslims and the whole nation was opposing and resisting him relentlessly, the confrontation between Islam and disbelief appeared to be utterly unequal. No one at that time could imagine that after a few years the tables would be turned on disbelief. Rather, the superficial observer could safely predict that the strong opposition of the Quraish and entire. Arabia would at last put an end to the message of Islam. But even under those conditions, a challenge was thrown to the disbelievers and they were told in clear terms: "You may devise whatever plots you wish in order to frustrate this message, they will all recoil upon you, and you will never succeed in defeating and putting an end to it. "
Source : AT-Tur Verse 42: Or do they intend a plan? But those who disbelieve - they are the object of a plan.