Al-Kāfi

Hadith 662
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11ـ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ مُحَمَّدِ بْنِ عِيسَى عَنْ يُونُسَ عَنْ عُمَرَ بْنِ أُذَيْنَةَ عَنْ زُرَارَةَ قَالَ قُلْتُ الْفَقِيرُ الَّذِي يُتَصَدَّقُ عَلَيْهِ هَلْ عَلَيْهِ صَدَقَةُ الْفِطْرَةِ فَقَالَ نَعَمْ يُعْطِي مِمَّا يُتَصَدَّقُ بِهِ عَلَيْهِ.
11. Ali ibn Ibrahim has narrated from Muhammad ibn ‘Isa from Yunus from ‘Umar ibn ‘Udhaynah from Zurarah who has said the following: “I once asked abu ‘Abd Allah (a.s.), about a man who receives al-Fitrah: if he is required to pay al-Fitrah. He (the Imam) said, ‘Yes, he is required to pay al-Fitrah from what he receives as al- Fitrah.’”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī