Narrated Anas ibn Malik: The king of Rome presented a fur of silk brocade to the Prophet (ﷺ) and he wore it. The scene that his hands were moving (while wearing the robe) is before my eyes. He then sent it to Ja'far who wore it and came to him. The Prophet (ﷺ) said: I did not send it to you to wear. He asked: What should I do with it? He replied: Send it to your brother Negus.
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، حَدَّثَنَا حَمَّادٌ، عَنْ عَلِيِّ بْنِ زَيْدٍ، عَنْ أَنَسِ بْنِ مَالِكٍ، أَنَّ مَلِكَ الرُّومِ، أَهْدَى إِلَى النَّبِيِّ صلى الله عليه وسلم مُسْتَقَةً مِنْ سُنْدُسٍ فَلَبِسَهَا فَكَأَنِّي أَنْظُرُ إِلَى يَدَيْهِ تَذَبْذَبَانِ ثُمَّ بَعَثَ بِهَا إِلَى جَعْفَرٍ فَلَبِسَهَا ثُمَّ جَاءَهُ فَقَالَ النَّبِيُّ صلى الله عليه وسلم " إِنِّي لَمْ أُعْطِكَهَا لِتَلْبَسَهَا " . قَالَ فَمَا أَصْنَعُ بِهَا قَالَ أَرْسِلْ بِهَا إِلَى أَخِيكَ النَّجَاشِيِّ .
sunnah.com