What is the grammatical analysis (إعراب) of the letter "fa" (الفاء) in "فقد سرق" and the grammatical position (محل) of the sentence "فقد سرق أخ له من قبل," along with an estimation of the omitted apodosis (جواب الشرط) in His (Allah's) saying, "They said, 'If he steals, a brother of his has stolen before him'"?

The answer to the condition is mentioned in the verse as "he has stolen." And "qad" (قد) is one of the seven instances where the answer to the condition must be linked with the fa' (فـ). The fa' here connects the answer to the condition, and the sentence is in the jazm (jussive) case as the answer to the condition. Another grammatical analysis is possible, which is that the answer to the condition is omitted, estimated as "so do not be surprised," and in this case, the fa' would be for causation or reason.