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:8713Abū ʿAbdullāh al-Ḥāfiẓ And ʾAbū Saʿīd b. Abū ʿAmr al-Ṣayrafī > Abū al-ʿAbbās Muḥammad b. Yaʿqūb > Ibrāhīm b. Marzūq > Abū ʿĀmir > Sufyān > Khuṣayf > Miqsam > Ibn ʿAbbās al-Ḥaj Ashhur Maʿlūmāt al-Bqrh 197

[Machine] "Shawwal, Dhul-Qadah, and the first ten days of Dhul-Hijjah have been confirmed by Ikrimah from Ibn Abbas, if Allah wills."  

البيهقي:٨٧١٣وَأَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ وَأَبُو سَعِيدِ بْنُ أَبِي عَمْرٍو الصَّيْرَفِيُّ قَالَا ثنا أَبُو الْعَبَّاسِ مُحَمَّدُ بْنُ يَعْقُوبَ ثنا إِبْرَاهِيمُ بْنُ مَرْزُوقٍ ثنا أَبُو عَامِرٍ ثنا سُفْيَانُ عَنْ خُصَيْفٍ عَنْ مِقْسَمٍ عَنِ ابْنِ عَبَّاسٍ {الْحَجُّ أَشْهُرٌ مَعْلُومَاتٌ} [البقرة 197] قَالَ

شَوَّالٌ وَذُو الْقَعْدَةِ وَعَشْرٌ مِنْ ذِي الْحِجَّةِ وَقَدْ ثَبَتَ ذَلِكَ عَنْ عِكْرِمَةَ عَنِ ابْنِ عَبَّاسٍ وَذَلِكَ يَرِدُ إِنْ شَاءَ اللهُ