(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." (ES)
Reference (ES): Jami` at-Tirmidhi 730 (ES)
In-book reference (ES): Book 8, Hadith 49 (ES)
English translation (ES): Vol. 2, Book 3, Hadith 730 (ES)