Messenger of Allah ﷺ said, "The keys of Unseen are five which none knows but Allah: None knows what will happen tomorrow but Allah; none knows what is in the wombs (a male child or a female) but Allah; none knows when it will rain but Allah; none knows at what place one will die; none knows when the Hour will be established but Allah." (See The Qur'an 31:34.") (Using translation from Bukhārī 4697)  

قَالَ رَسُولُ اللهِ ﷺ «مَفَاتِيحُ الْغَيْبِ خَمْسٌ لَا يَعْلَمُهَا إِلَّا اللهُ لَا يَعْلَمُ مَا تَغِيضُ الْأَرْحَامُ أَحَدٌ إِلَّا اللهُ وَلَا يَعْلَمُ مَا فِي غَدٍ إِلَّا اللهُ وَلَا يَعْلَمُ مَتَى يَأْتِي الْمَطَرُ إِلَّا اللهُ وَلَا تَعْلَمُ نَفْسٌ بِأَيِّ أَرْضٍ تَمُوتُ وَلَا يَعْلَمُ مَتَى تَقُومُ السَّاعَةُ أَحَدٌ إِلَّا اللهُ ﷻ»  

[Machine] Once the Prophet ﷺ sent a man to a man from the pharaohs of Arabia to invite him to Islam. The man replied, "O Messenger of Allah, he is stronger than that." The Prophet ﷺ said, "Go to him and invite him." The man went to him and said, "The Messenger of Allah invites you." The man asked, "Is he the Messenger of Allah? Is he made of gold? Is he made of silver? Is he made of copper?" Then he returned to the Prophet ﷺ and said, "O Messenger of Allah, I told you that he is stronger than that." The Prophet ﷺ informed him about what he said and said, "Go back to him and invite him." So he returned to him and repeated the same question. While they were arguing, Allah sent a cloud over his head, it thundered, and a lightning struck him, taking off his headgear. And Allah revealed, "And He sends thunderbolts, and they strike with them whom He wills while they dispute about Allah; and He is severe in assault" (Quran 13:13).  

بَعَثَ النَّبِيُّ ﷺ مَرَّةً رَجُلًا إِلَى رَجُلٍ مِنْ فَرَاعِنَةِ الْعَرَبِ أَنِ ادْعُهُ لِي قَالَ يَا رَسُولَ اللهِ إِنَّهُ أَعْتَى مِنْ ذَلِكَ قَالَ «اذْهَبْ إِلَيْهِ فَادْعُهُ» قَالَ فَأَتَاهُ فَقَالَ رَسُولُ اللهِ ﷺ «يَدْعُوكَ» قَالَ أَرَسُولُ اللهِ؟ وَمَا اللهُ؟ أَمِنْ ذَهَبٍ هُوَ؟ أَمْ مِنْ فِضَّةٍ هُوَ؟ أَمِنْ نُحَاسٍ هُوَ؟ فَرَجَعَ إِلَى النَّبِيِّ ﷺ فَقَالَ يَا رَسُولَ اللهِ قَدْ أَخْبَرْتُكَ أَنَّهُ أَعْتَى مِنْ ذَلِكَ وَأَخْبَرَ النَّبِيَّ ﷺ بِمَا قَالَ قَالَ «فَارْجِعْ إِلَيْهِ فَادْعُهُ» فَرَجَعَ فَأَعَادَ عَلَيْهِ الْمَقَالَةَ الْأُولَى فَرَدَّ عَلَيْهِ مِثْلَ الْجَوَابِ فَأَتَى النَّبِيَّ ﷺ فَأَخْبَرَهُ فَقَالَ «ارْجِعْ إِلَيْهِ فَادْعُهُ» فَرَجَعَ إِلَيْهِ فَبَيْنَمَا هُمَا يَتَرَاجَعَانِ الْكَلَامَ بَيْنَهُمَا إِذْ بَعَثَ اللهُ سَحَابَةً حِيَالَ رَأْسِهِ فَرَعَدَتْ وَوَقَعَتْ مِنْهَا صَاعِقَةٌ فَذَهَبَتْ بِقَحْفِ رَأْسِهِ وَأَنْزَلَ اللهُ ﷻ {وَيُرْسِلُ الصَّوَاعِقَ فَيُصِيبُ بِهَا مَنْ يَشَاءُ وَهُمْ يُجَادِلُونَ فِي اللهِ وَهُوَ شَدِيدُ الْمِحَالِ} [الرعد 13]