صحيح ابن خزيمه
Sahih Ibn Khuzaymah
جماع أبواب صدقة الفطر فى رمضانChapters on Zakat al-Fitr in Ramadan
(120) بَابُ الدَّلِيلِ عَلَى أَنَّهُمْ أُمِرُوا بِنِصْفِ صَاعِ حِنْطَةٍ إِذَا كَانَ ذَلِكَ قِيمَةَ صَاعِ تَمْرٍ أَوْ شَعِيرٍ،120 Subchapter: They were told to give half a sa’ of wheat if it equaled a sa’ of dates or barley
Hadith Q2407
وَالْوَاجِبُ عَلَى هَذَا الْأَصْلِ أَنْ يَتَصَدَّقَ بِآصِعٍ مِنْ حِنْطَةٍ فِي بَعْضِ الْأَزْمَانِ وَبَعْضِ الْبُلْدَانِ.
And what is obligatory according to this principle is to give charity of a measure (sa’) of wheat in some times and some lands.
