Some of the
Shafiy scholars explain this hadith.
Imam Navavi® quotes: "Some of our followers
say: If the Hilal is seen at one place it is binding on all people on the
Earth. Certainly Ibn Abbas® did not accept Kuraib's information because of lack
of evidence. An evidence cannot be confirmed by one person." (Sharah
Muslim: 4-212)
Imam Shaukani®'s interpretation is quoted and
accepted in Turmudi's explanatory work Tuhfathul Ahvadiyya (vol.3, P 379).
"Ibn Abbas® rejected Kuraib's statement for want of witnesses."