[Machine] I heard the Messenger of Allah ﷺ saying, "Who will take my book to the tyrant of the Romans?" He presented this to them three times, and at that, he said, "Who will go, and paradise belongs to him? Even if I perish without it?" A man from the Ansar named Ubaydullah ibn 'Abd al-Khaliq said, "I will go with it, and paradise belongs to me, even if I perish without it." He said, "Yes, paradise belongs to you if you reach (the tyrant), and even if you are killed or perish, Allah has made Paradise obligatory for you." He then took the book of the Prophet ﷺ and proceeded until he reached the tyrant and said, "I am the Messenger of the Messenger of the Lord of the worlds." He was given permission and entered upon him. The tyrant of the Romans recognized that he had come with the truth from a sent prophet. He then presented the book of the Prophet ﷺ to him, gathered the Romans around him, and presented it to them. They disliked what he brought and believed in it, and one of them believed in it and was killed because of his belief. Then, indeed, the man returned to the Prophet ﷺ and informed him of what had happened, including the killing of the man. At that, the Prophet ﷺ said, "Allah will send him as a single nation." That is the man who was killed.  

سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ «مَنْ يَذْهَبُ بِكِتَابِي هَذَا إِلَى طَاغِيَةِ الرُّومِ؟» فَعَرَضَ ذَلِكَ عَلَيْهِمْ ثَلَاثَ مَرَّاتٍ فَقَالَ عِنْدَ ذَلِكَ «مَنْ يَذْهَبُ وَلَهُ الْجَنَّةُ؟» فَقَالَ رَجُلٌ مِنَ الْأَنْصَارِ يُدْعَى عُبَيْدَ اللهِ بْنَ عَبْدِ الْخَالِقِ أَنَا أَذْهَبُ بِهِ وَلِيَ الْجَنَّةُ إِنْ هَلَكْتُ دُونَ ذَلِكَ؟ قَالَ «نَعَمْ لَكَ الْجَنَّةُ إِنْ بَلَغْتَ وَإِنْ قُتِلْتَ وَإِنْ هَلَكْتَ فَقَدْ أَوْجَبَ اللهُ لَكَ الْجَنَّةَ» فَانْطَلَقَ بِكِتَابِ النَّبِيِّ ﷺ حَتَّى بَلَغَ الطَّاغِيَ فَقَالَ أَنَا رَسُولُ رَسُولِ رَبِّ الْعَالَمِينَ فَأَذِنَ لَهُ فَدَخَلَ عَلَيْهِ فَعَرَفَ طَاغِيَةُ الرُّومِ أَنَّهُ قَدْ جَاءَ بِالْحَقِّ مِنْ عِنْدِ نَبِيٍّ مُرْسَلٍ ثُمَّ عَرَضَ عَلَيْهِ كِتَابَ النَّبِيِّ ﷺ فَجَمَعَ الرُّومَ عِنْدَهُ ثُمَّ عَرَضَهُ عَلَيْهِمْ فَكَرِهُوا مَا جَاءَ بِهِ وَآمَنَ بِهِ رَجُلٌ مِنْهُمْ فَقُتِلَ عِنْدَ إِيمَانِهِ ثُمَّ إِنَّ الرَّجُلَ رَجَعَ إِلَى النَّبِيِّ ﷺ فَأَخْبَرَهُ بِالَّذِي كَانَ مِنْهُ وَمَا كَانَ مِنْ قَتْلِ الرَّجُلِ فَقَالَ النَّبِيُّ ﷺ عِنْدَ ذَلِكَ «يَبْعَثُهُ اللهُ أُمَّةً وَحْدَهُ» لِذَلِكَ الرَّجُلِ الْمَقْتُولِ