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It was narrated that Ibn 'Umar said:

"If a man does not intend to fast from the night before, he should not fast."
أَخْبَرَنَا مُحَمَّدُ بْنُ عَبْدِ الأَعْلَى، قَالَ حَدَّثَنَا الْمُعْتَمِرُ، قَالَ سَمِعْتُ عُبَيْدَ اللَّهِ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، قَالَ إِذَا لَمْ يُجْمِعِ الرَّجُلُ الصَّوْمَ مِنَ اللَّيْلِ فَلاَ يَصُمْ ‏.‏

Classification

Sahih (Authentic)

References

• Sunan an-Nasa'i, 2342
• Sunan an-Nasa'i, Vol. 3, Book of Fasting, Hadith 2344
• Sunan an-Nasa'i, Book of Fasting, Hadith 2344