This report may bear two meanings. One of them is that the Imam عليه السلام, peace be upon him, intended four mudds (amdad), but it was altered in transcription for the narrator into ratls (artal), and we have already presented that previously. The second is that he intended four ratls of milk (laban) and dried curd (aqit), because whoever has that as his staple food, the amount mentioned in the report is obligatory upon him from it, according to what we have already presented. What makes that clear is what was narrated (in the following hadith):
Commentary #4