1؎: This reward was in the form of a nafl (supererogatory gift), and nafl refers to that reward which is given to a mujahid (fighter in the path of Allah) in excess of his share as a recompense for his performance and bravery. This sword originally belonged to ‘As bin Umayyah, which was used on the day of Badr. Then it came into the possession of the Messenger of Allah (sallallahu alayhi wa sallam), and he gave it to Ali (radi Allahu anhu), and this sword remained with him until his death.
Explanation & Benefits
Maulana Ataullah Sajid
Benefits and Issues: ➊ Allah Almighty has designated one-fifth of the spoils of war (ghanimah) for Allah and His Messenger. (Surah Al-Anfal, verse: 41) In an Islamic government, this portion is deposited into the public treasury (Bayt al-Mal) and spent on the collective needs of the Muslims.
➋ The Messenger of Allah (sallallahu alayhi wa sallam) used to fulfill his personal expenses from the one-fifth share of the spoils (khums). Therefore, for the need of jihad, he also took a sword from the khums.
➌ This sword is called Dhu’l-Fiqar because it had some deep marks on it, similar to the vertebrae of the spine. (See: Al-Nihayah by Ibn Athir, under the root "faqar")
Source: Commentary on Sunan Ibn Mājah by Mawlānā ‘Atā’ullāh Sājid, Page: 2808
‘Ubadah bin Samit (may Allah be pleased with him) reports that when the Prophet (peace and blessings of Allah be upon him) sent out a detachment at the beginning, he would give a quarter share, and when they went again after returning from battle, he would give an additional third share as a reward (nafl). __QUR_N__
Imam Tirmidhi says: 1- The hadith of ‘Ubadah (may Allah be pleased with him) is Hasan. 2- This hadith is narrated from Abu Salam, who narrated it from a Companion, and he narrated it from the Prophet (peace and blessings of Allah be upon him). 3- In this chapter, there are also ahadith from Ibn ‘Abbas, Habib bin Maslamah, Ma’n bin Yazid, Ibn ‘Umar, and Salamah bin al-Akwa‘ (may Allah be pleased with them).
Shaykh Dr. Abdur Rahman Freywai
Explanation: 1: Because after returning from battle, going back again for jihad is a difficult task.
Source: Sunan al-Tirmidhi – Majlis ‘Ilmi Dar al-Da‘wah, New Delhi Edition, Page: 1561