Honoring the Guests:
‘Isa bin ‘Umailah Al-Fazaari (rahimahullah) mentions that a certain person told him the following:
I noticed that when Hazrat Abu Zar (radhiyallahu ‘anhu) would milk his goats, he would give his neighbors and guests to drink before he drank himself. One night, I saw him milk his goats to the point where absolutely nothing remained in their udders. After presenting the milk to his guests, he placed a small amount of dates before them. He thereafter apologized to them saying, “If we had anything better than this, we would have definitely brought it before you.” I thereafter observed that Hazrat Abu Zar (radhiyallahu ‘anhu) himself did not eat a single morsel that night as he had presented all that he had to his guests.
(Ibn Sa’d 4/178)
Carrying the Flag at Hunayn:
The renowned historian, Imaam Waaqidi (rahimahullah), has mentioned that Hazrat Abu Zar (radhiyallahu ‘anhu) carried the flag of his tribe, the Ghifaar, during the Battle of Hunayn.
(Siyar A’laam min Nubalaa 3/384)
Migration to Shaam:
After the demise of Hazrat Abu Bakr (radhiyallahu ‘anhu), Hazrat Abu Zar (radhiyallahu ‘anhu) migrated from Madinah Munawwarah to the land of Shaam.
(Usdul Ghaabah 1/344)
As Hazrat Abu Zar (radhiyallahu ‘anhu) was present in Shaam, he witnessed the conquest of Baytul Maqdis with Hazrat Umar (radhiyallahu ‘anhu).
(Siyar A’laam min Nubalaa 3/379)
