Sahih al-Bukhari 2909
Sahih al-Bukhari · Book 56: Fighting for the Cause of Allah (Jihaad) · The decoration of swords (with gold and silver etc.)
Narrated Abu Umama:
حَدَّثَنَا أَحْمَدُ بْنُ مُحَمَّدٍ ، أَخْبَرَنَا عَبْدُ اللَّهِ ، أَخْبَرَنَا الأَوْزَاعِيُّ ، قَالَ سَمِعْتُ سُلَيْمَانَ بْنَ حَبِيبٍ ، قَالَ سَمِعْتُ أَبَا أُمَامَةَ ، يَقُولُ لَقَدْ فَتَحَ الْفُتُوحَ قَوْمٌ مَا كَانَتْ حِلْيَةُ سُيُوفِهِمِ الذَّهَبَ وَلاَ الْفِضَّةَ، إِنَّمَا كَانَتْ حِلْيَتُهُمُ الْعَلاَبِيَّ وَالآنُكَ وَالْحَدِيدَ.
Some people conquered many countries and their swords were decorated neither with gold nor silver, but they were decorated with leather, lead and iron.