Shama-il Tirmidhi Chapter 25, Hadith Number 6 (148).
Zahdam Al-Jarmi RA. says: “We were present in the company of Abu Musa Ash’ari. Food was presented to him in which there was fowl meat also. Among those present was a person from the tribe of Banu Taymillah who was reddish in colour and seemed a freed slave. He moved back and sat on one side. Abu Musa asked him to come near (and partake of the food) and related to him that Rasulullah Sallallahu ‘Alayhi Wasallam also ate the meat of a fowl. He excused himself saying: ‘I had seen it eating such a thing which makes me dislike eating it. For this reason I had sworn an oath that I shall not eat it'”.
This is the same hadith that has been mentioned previously. Because of the difference in the chain of narrators, there is also a difference in the describing of the narration. Both ahaadith are described in brief in the Shamaa-il. This incident is mentioned in detail in the Bukhaari, where it is stated that in the end Sayyidina Abu Musa Ash’ari Radiyallahu ‘Anhu told him to partake of the fowl and give a kaffaarah for the oath. What does it mean, or what is derived by swearing an oath not to eat a thing which is halaal?