And they had planned their plan, but with Allah is [recorded] their (14:46)

﴿وَقَدْ مَكَرُوا مَكْرَهُمْ وَعِندَ اللَّهِ مَكْرُهُمْ وَإِن كَانَ مَكْرُهُمْ لِتَزُولَ مِنْهُ الْجِبَالُ﴾
[ إبراهيم: 46]

14:46 And they had planned their plan, but with Allah is [recorded] their plan, even if their plan had been [sufficient] to do away with the mountains.

Those who took up residence in the living spaces of the wrongful nations arranged a plot to kill the Prophet Muhammad ( peace be upon him ) and put an end to his mission.
Allah knows of their plans and nothing remains hidden from Him.
Their plan was weak, for it is unable to move the mountains or anything else, contrary to Allah’s plan against them.

Indeed, they planned their plot, and their plot was with Allah, though their plot was a great (one, still) it would never be able to remove the mountains (real mountains or the Islamic law) from their places (as it is of no importance) [Tafsir Ibn Kathir, Vol. 2, Page 597]. [It is said by some interpreters regarding this Verse that the Quraish pagans plotted against Prophet Muhammad SAW to kill him but they failed and were unable to carry out their plot which they plotted].

phonetic Transliteration

Waqad makaroo makrahum waAAinda Allahi makruhum wain kana makruhum litazoola minhu aljibalu

Abdullah Yusuf Ali - Translation

Mighty indeed were the plots which they made, but their plots were (well) within the sight of Allah, even though they were such as to shake the hills!

Safi-ur-Rahman al-Mubarakpuri

Indeed, they planned their plot, and their plot was with Allah, though their plot was not such as to remove the mountains from their places.

Page 261 English transliteration