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.
bayhaqi:5391Abū Muḥammad b. Yaḥyá > Ismāʿīl > Aḥmad b. Manṣūr al-Ramādī > ʿAbd al-Razzāq > Mālik > Nāfiʿ > Ibn ʿUmar

[Machine] And he said, "These are three nights."  

البيهقي:٥٣٩١وَأَخْبَرَنَا أَبُو مُحَمَّدِ بْنُ يَحْيَى أنبأ إِسْمَاعِيلُ ثنا أَحْمَدُ بْنُ مَنْصُورٍ الرَّمَادِيُّ ثنا عَبْدُ الرَّزَّاقِ أنبأ مَالِكٌ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ أَنَّهُ قَصَرَ الصَّلَاةَ فِي خَيْبَرَ

وَقَالَ هَذِهِ ثَلَاثُ قَوَاصِدَ يَعْنِي لَيَالِيَ