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:19977Abū al-Ḥasan ʿAlī b. ʿAbdullāh al-Khusrawjirdī > Abū Aḥmad Muḥammad b. Aḥmad b. al-Ghaṭrīf > Abū Khalīfah > al-Ḥawḍī > Hishām > Qatādah > al-Ḥasan And Saʿīd b. al-Musayyib Annahumā

[Machine] About Al-Hasan and Sa'id ibn al-Musayyib, they said about expiation, "It can be the measurement of wheat or the measurement of barley."  

البيهقي:١٩٩٧٧حَدَّثَنَا أَبُو الْحَسَنِ عَلِيُّ بْنُ عَبْدِ اللهِ الْخُسْرَوْجِرْدِيُّ أنبأ أَبُو أَحْمَدَ مُحَمَّدُ بْنُ أَحْمَدَ بْنِ الْغَطْرِيفِ أنبأ أَبُو خَلِيفَةَ ثنا الْحَوْضِيُّ ثنا هِشَامٌ عَنْ قَتَادَةَ

عَنِ الْحَسَنِ وَسَعِيدِ بْنِ الْمُسَيِّبِ أَنَّهُمَا قَالَا فِي الْكَفَّارَةِ مُدُّ حِنْطَةٍ أوْ مُدُّ شَعِيرٍ