Mujahid (may Allah have mercy on him) said: Wherever the mention of "ta‘am" (food) occurs in the context of expiation in the Qur'an, it refers to half a sa‘.
Hadith Referenceسنن سعید بن منصور / كتاب التفسير / 792
Hadith Gradingمحدثین:سنده ضعيف لضعف عبد الكريم، وهو صحيح لغيره كما سيأتي.
Hadith Takhrij«انفرد به المصنف من هذا الطريق»
Brief Explanation
(1) It is the same in the Dar al-Sumai'i edition, and perhaps: (bin) here is superfluous. See the sources of the biography, and Allah knows best.