We now begin the main part of the Seder, which is to tell the story, and fulfil the obligation stated in the Gemara, to recite the passage of “Arami oved avi”, and then expound upon it.Thus, we read the text, and then go through it line by line, offering explanations, proof-texts, and sometimes both. The explanations – the “midrash” – were probably not written specially for the Haggadah, but were put together from well-known interpretations. (Just like today, even in antiquity...