Narrated Asma bint Abu Bakr: I used to carry the date stones on my head from the land of Az-Zubair which Allah's Apostle had given to him, and it was at a distance of 2/3 of a Farsakh from my house. Narrated Hisham's father: The Prophet gave Az-Zubair a piece of land from the property of Bani An- Nadir (gained as war booty).
Hadith Referenceصحيح البخاري / كتاب فرض الخمس / 3151
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة
Hadith Commentary: Hafiz (rahimahullah) said: I have not found this suspended narration (ta'liq) with a connected chain (mawsulan). The purpose of Imam Bukhari (rahimahullah) in mentioning this is to show that Abu Zumrah narrated this hadith as mursal (with a missing link), contrary to Abu Usamah who narrated it as connected (mawsul).
The Prophet (sallallahu alayhi wa sallam) granted some land as a fief (jagir) to Zubair (radi Allahu anhu). From this, the purpose of the chapter is derived: that the Imam has the authority to distribute from the khums and other such shares as he deems appropriate according to the situation.
Source: Sahih Bukhari: Commentary by Maulana Dawood Raz, Page: 3151
Shaykh Abdul Sattar al-Hammad
Hadith Commentary: 1. Hazrat Zubair bin al-Awwam (radi Allahu anhu) was the esteemed husband of Hazrat Asma bint Abi Bakr (radi Allahu anha). That land was approximately 2 miles away from their house, because a farsakh is 3 miles. Accordingly, two-thirds of a farsakh equals 2 miles. 2. Imam Bukhari (rahimahullah) has established from this hadith that the Imam of the time is authorized to distribute from the khums and other such assets as he deems appropriate, just as the Messenger of Allah (sallallahu alayhi wa sallam) granted land from the wealth of Banu Nadir to Hazrat Zubair (radi Allahu anhu).
Source: Hidayat al-Qari: Commentary on Sahih Bukhari, Urdu, Page: 3151