Reply To: Putting on Tefilin on Chal Hamoed

Only according to the Zohar (Rabbi Shimon) who holds Pesochim 28:1 that chometz is only forbidden biblically from the night on. He compares chametz to matzah. The time when you are obligated to eat matzah you are forbidden to eat chametz. Asks the Pnei Yeshuah what about the whole seven days? He answers that Rabbi Shimon’s view is that there is an obligation of matzah the whole seven days. The os is the eating of matzoh but we only hold that the mitzva is only the first day so there is no os except the GRA whose view is that there is a mitzva kiyumis, See the Shut Kol Aryeh siman 30.