(33) باب مَا جَاءَ لاَ صِيَامَ لِمَنْ لَمْ يَعْزِمْ مِنَ اللَّيْلِ
Hafsah narrated that:
the Prophet said: "Whoever did not decide to fast before Fajr then there is no fast for him." (JA)
Reference (JA): Jami` at-Tirmidhi 730 (JA)
In-book reference (JA): Book 8, Hadith 49 (JA)
English translation (JA): Vol. 2, Book 3, Hadith 730 (JA)