Sunan Ibn Majah 1646
سنن ابن ماجه#1646Sahihحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا حَفْصُ بْنُ غِيَاثٍ، عَنْ عَبْدِ اللَّهِ بْنِ سَعِيدٍ، عَنْ جَدِّهِ، عَنْ أَبِي هُرَيْرَةَ، قَالَ نَهَى رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ عَنْ تَعْجِيلِ صَوْمِ يَوْمٍ قَبْلَ الرُّؤْيَةِ .
It was narrated that Abu Hurairah said:“The Messenger of Allah (ﷺ) forbade anticipating the fast by fasting one day before sighting (of the crescent).”
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Al-AlbaniSahih
Muhammad Fouad Abd al-BaqiSahih
Shuaib Al ArnautDaif
Zubair Ali ZaiDaif
In-book reference: 7:9