Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
ibnmajah:1646Abū Bakr b. Abū Shaybah > Ḥafṣ b. Ghiyāth > ʿAbdullāh b. Saʿīd from his father > Abū Hurayrah

“The Messenger of Allah ﷺ forbade anticipating the fast by fasting one day before sighting (of the crescent).”  

ابن ماجة:١٦٤٦حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ حَدَّثَنَا حَفْصُ بْنُ غِيَاثٍ عَنْ عَبْدِ اللَّهِ بْنِ سَعِيدٍ عَنْ جَدِّهِ عَنْ أَبِي هُرَيْرَةَ قَالَ

نَهَى رَسُولُ اللَّهِ ﷺ عَنْ تَعْجِيلِ صَوْمِ يَوْمٍ قَبْلَ الرُّؤْيَةِ