So they plotted a plot, and We planned a plan, while they

﴿وَمَكَرُواْ مَكۡرٗا وَمَكَرۡنَا مَكۡرٗا وَهُمۡ لَا يَشۡعُرُونَ ﴾
[النَّمل: 50]

So they plotted a plot, and We planned a plan, while they perceived not

﴿ومكروا مكرا ومكرنا مكرا وهم لا يشعرون﴾ [النَّمل: 50]

Al Bilal Muhammad Et Al
They plotted and planned, but We too planned, even while they perceived it not

Ali Bakhtiari Nejad
They plotted a plot, and We planned a plot, and they do not realize

Ali Quli Qarai
They devised a plot, and We [too] devised a plan, but they were not aware

Ali Unal
And so they devised a scheme, and indeed We put Our will into force (to give them their just deserts), while they were not aware

Hamid S Aziz
And they plotted a plot, and We plotted a plot while they perceive not

John Medows Rodwell
And they devised a device, and we devised a device, and they were not aware of it

Literal
And they schemed , a scheme and We schemed a scheme , and (while) they are not feeling/knowing/sensing

Mir Anees Original
And they planned a plan and We (too) planned a plan while they did not perceive

Mir Aneesuddin
And they planned a plan and We (too) planned a plan while they did not perceive