The Book of Fasting
22/68. Chapter:
Mentioning the Differences Narrated by those who Reported the Narration from Hafsah concerning that
Sunan an-Nasai
أَخْبَرَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، قَالَ أَنْبَأَنَا سُفْيَانُ، عَنِ الزُّهْرِيِّ، عَنْ حَمْزَةَ بْنِ عَبْدِ اللَّهِ بْنِ عُمَرَ، عَنْ حَفْصَةَ، قَالَتْ لاَ صِيَامَ لِمَنْ لَمْ يُجْمِعِ الصِّيَامَ قَبْلَ الْفَجْرِ .
It was narrated that Hafsah said: "There is no fast for the one who does not intend to fast before dawn.
Reference : Sunan an-Nasa'i 2339In-book reference : Book 22, Hadith 250English translation : Vol. 3, Book 22, Hadith 2341