It was narrated from Ibn ‘Abbas that the Messenger of Allah (ﷺ) acquired his sword Dhulfiqar, from the spoils of war on the Day of badr.
Sunan Ibn Majah Book 24, Hadith 56
← Previous Hadith “We entered upon Abu Umamah and he saw some silver ornaments on our swords. He got angry and said: ‘People conquered lands and their swords were not adorned with gold and silver, but with lead and iron and ‘Alabi.’”

Sunan Ibn Majah Book 24, Hadith 55 Next Hadith → “When Mughirah bin Shu’bah fought alongside the Prophet (ﷺ) he would carry a spear, and when he would come back he would throw his spear down so that someone would pick it up and give it back to him.” ‘Ali said to him: “I will tell the Messenger of Allah (ﷺ) about that.” He (the Prophet (ﷺ)) said: “Do not do that, for it you do that it will not be picked up as a lost item to be returned.”

Sunan Ibn Majah Book 24, Hadith 57