Arbad ibn Qays was a man of Banu Amir ibn Sa'sa'ah and the henchman of its chieftain Amir ibn al-Tufayl, who came with Amir's delegation to Madinah, probably in 7 or 8 AH, to kill the Prophet ﷺ while Amir distracted him. Signalled three times, he never struck, saying afterwards that he could see only Amir and not the Prophet ﷺ, as Allah protected His Messenger ﷺ. Back home he spoke offensively of Allah and was killed by lightning with his camel the next day, and verses of Surah al-Ra'd are said to refer to him.
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لَهُ مُعَقِّبَاتٌ مِّن بَيْنِ يَدَيْهِ وَمِنْ خَلْفِهِ يَحْفَظُونَهُ مِنْ أَمْرِ اللَّهِ ۗ إِنَّ اللَّهَ لَا يُغَيِّرُ مَا بِقَوْمٍ حَتَّىٰ يُغَيِّرُوا مَا بِأَنفُسِهِمْ ۗ وَإِذَا أَرَادَ اللَّهُ بِقَوْمٍ سُوءًا فَلَا مَرَدَّ لَهُ ۚ وَمَا لَهُم مِّن دُونِهِ مِن وَالٍ
“For each one there are successive angels before and behind, protecting them by Allah's command. Indeed, Allah would never change a people's state [of favor] until they change their own state [of faith]. And if it is Allah's Will to torment a people, it can never be averted, nor can they find a protector other than Him.”
It is said (hedged in the lecture as "it is said") that this passage refers to his death by lightning after speaking impiously of Allah.
وَيُسَبِّحُ الرَّعْدُ بِحَمْدِهِ وَالْمَلَائِكَةُ مِنْ خِيفَتِهِ وَيُرْسِلُ الصَّوَاعِقَ فَيُصِيبُ بِهَا مَن يَشَاءُ وَهُمْ يُجَادِلُونَ فِي اللَّهِ وَهُوَ شَدِيدُ الْمِحَالِ
“The thunder glorifies His praises, as do the angels in awe of Him. He sends thunderbolts, striking with them whoever He wills. Yet they dispute about Allah. And He is tremendous in might.”
It is said (hedged as "it is said") that this passage, mentioning thunderbolts striking whoever Allah wills, refers to his death.