Hadith 4:609
Waki’ narrated to us, from Sufyan, from Abd al-Karim, from Umar ibn Abd al-Aziz, that a group testified regarding the crescent of Ramadan after the people had already entered the morning. He said: "Whoever has not eaten, let him complete his fast, and whoever has eaten, let him fast the remainder of his day."
حدثنا وكيع عن سفيان عن عبد الكريم عن عمر بن عبد العزيز أن قوما شهدوا على هلال رمضان بعد ما أصبح الناس فقال من لم يأكل فليتم صومه ومن أكل فليصم بقية يومه