The root ر ص د (r-ṣ-d) in the Quran

فَإِذَا ٱنسَلَخَ ٱلْأَشْهُرُ ٱلْحُرُمُ فَٱقْتُلُوا۟ ٱلْمُشْرِكِينَ حَيْثُ وَجَدتُّمُوهُمْ وَخُذُوهُمْ وَٱحْصُرُوهُمْ وَٱقْعُدُوا۟ لَهُمْ كُلَّ مَرْصَدٍ فَإِن تَابُوا۟ وَأَقَامُوا۟ ٱلصَّلَوٰةَ وَءَاتَوُا۟ ٱلزَّكَوٰةَ فَخَلُّوا۟ سَبِيلَهُمْ إِنَّ ٱللَّهَ غَفُورٌ رَّحِيمٌ ۝٥

And when the inviolable months have passed, then kill the polytheists wherever you find them and capture them and besiege them and sit in wait for them at every place of ambush. But if they should repent, establish prayer, and give zakāh, let them [go] on their way. Indeed, Allāh is Forgiving and Merciful.

وَٱلَّذِينَ ٱتَّخَذُوا۟ مَسْجِدًا ضِرَارًا وَكُفْرًا وَتَفْرِيقًۢا بَيْنَ ٱلْمُؤْمِنِينَ وَإِرْصَادًا لِّمَنْ حَارَبَ ٱللَّهَ وَرَسُولَهُۥ مِن قَبْلُ وَلَيَحْلِفُنَّ إِنْ أَرَدْنَآ إِلَّا ٱلْحُسْنَىٰ وَٱللَّهُ يَشْهَدُ إِنَّهُمْ لَكَٰذِبُونَ ۝١٠٧

And [there are] those [hypocrites] who took for themselves a mosque for causing harm and disbelief and division among the believers and as a station for whoever had warred against Allāh and His Messenger before. And they will surely swear, "We intended only the best." And Allāh testifies that indeed they are liars.

وَأَنَّا كُنَّا نَقْعُدُ مِنْهَا مَقَٰعِدَ لِلسَّمْعِ فَمَن يَسْتَمِعِ ٱلْـَٔانَ يَجِدْ لَهُۥ شِهَابًا رَّصَدًا ۝٩

And we used to sit therein in positions for hearing, but whoever listens now will find a burning flame lying in wait for him.

إِلَّا مَنِ ٱرْتَضَىٰ مِن رَّسُولٍ فَإِنَّهُۥ يَسْلُكُ مِنۢ بَيْنِ يَدَيْهِ وَمِنْ خَلْفِهِۦ رَصَدًا ۝٢٧

Except whom He has approved of messengers, and indeed, He sends before him [i.e., each messenger] and behind him observers

إِنَّ جَهَنَّمَ كَانَتْ مِرْصَادًا ۝٢١

Indeed, Hell has been lying in wait

إِنَّ رَبَّكَ لَبِٱلْمِرْصَادِ ۝١٤

Indeed, your Lord is in observation.