"Whoever does not intend to fast from the night before, should not fast." (Daif) (Using translation from Nasāʾī 2335)
أَنَّهَا كَانَتْ تَقُولُ «مَنْ لَمْ يُجْمِعِ الصَّوْمَ مِنَ اللَّيْلِ فَلَا يَصُمْ»
"Whoever does not have the intention of fasting from the night before, then there is no fast for him." (Daif)
أَنَّ النَّبِيَّ ﷺ قَالَ مَنْ لَمْ يُبَيِّتِ الصِّيَامَ مِنَ اللَّيْلِ فَلاَ صِيَامَ لَهُ
"Whoever does not intend to fast from the night before, should not fast." (Daif)
أَنَّهَا كَانَتْ تَقُولُ مَنْ لَمْ يُجْمِعِ الصِّيَامَ مِنَ اللَّيْلِ فَلاَ يَصُومُ
"None should fast except the one who intended to fast before dawn."
أَنَّهُ كَانَ يَقُولُ لاَ يَصُومُ إِلاَّ مَنْ أَجْمَعَ الصِّيَامَ قَبْلَ الْفَجْرِ
Yahya related to me from Malik from Nafi that Abdullah ibn Umar used to say, "Only some one who makes the intention to fast before dawn (actually) fasts."
أَنَّهُ كَانَ يَقُولُ لاَ يَصُومُ إِلاَّ مَنْ أَجْمَعَ الصِّيَامَ قَبْلَ الْفَجْرِ
"Whoever does not have the intention of fasting from the night before, then there is no fast for him." (Daif) (Using translation from Nasāʾī 2334)
عَنْ رَسُولِ اللهِ ﷺ قَالَ مَنْ لَمْ يَجْمَعِ الصِّيَامَ مِنَ اللَّيْلِ فَلَا صِيَامَ لَهُ