from his father: "An-Najashi gave the Prophet ﷺ two black plain Khuff. So he wore them, then he performed Wudu and wiped over them."
أَنَّ النَّجَاشِيَّ أَهْدَى إِلَى النَّبِيِّ ﷺ خُفَّيْنِ أَسْوَدَيْنِ سَاذَجَيْنِ فَلَبِسَهُمَا ثُمَّ تَوَضَّأَ وَمَسَحَ عَلَيْهِمَا قَالَ هَذَا حَدِيثٌ حَسَنٌ إِنَّمَا نَعْرِفُهُ مِنْ حَدِيثِ دَلْهَمٍ وَقَدْ رَوَاهُ مُحَمَّدُ بْنُ رَبِيعَةَ عَنْ دَلْهَمٍ
Negus presented to the Messenger of Allah ﷺ two black and simple socks. He put them on; then he performed ablution and wiped over them. Musaddad reported this tradition from Dulham b. Salih. Abu Dawud said: This tradition has been narrated by the people of Basrah alone.
أَنَّ النَّجَاشِيَّ أَهْدَى إِلَى رَسُولِ اللَّهِ ﷺ خُفَّيْنِ أَسْوَدَيْنِ سَاذَجَيْنِ فَلَبِسَهُمَا ثُمَّ تَوَضَّأَ وَمَسَحَ عَلَيْهِمَا قَالَ مُسَدَّدٌ عَنْ دَلْهَمِ بْنِ صَالِحٍ
An-Najashi gave the Prophet a gift of a pair of plain black leather socks. He put them on, then he (performed ablution and) wiped over them. (Using translation from Ibn Mājah 549)
أَنَّ النَّجَاشِيَّ أَهْدَى إِلَى النَّبِيِّ ﷺ خُفَّيْنِ أَسْوَدَيْنِ سَاذَجَيْنِ فَلَبِسَهُمَا ثُمَّ تَوَضَّأَ وَمَسَحَ عَلَيْهِمَا