Concluding the laws of prayer in this tractate, the mishna raises several prayer-related matters. This mishna speaks of certain innovations in the prayer formula that warrant the silencing of a communal prayer leader who attempts to introduce them in his prayers, as their content tends toward heresy. One who recites in his supplication: Just as Your mercy is extended to a bird’s nest, as You have commanded us to send away the mother before taking her chicks or eggs (Deuteronomy 22:6–7), so too extend Your mercy to us; and one who recites: May Your name be mentioned with the good or one who recites: We give thanks, we give thanks twice, they silence him. This mishna and the next one deal with the communal prayer leader. (If one says: “May the good bless You,” this is a path of heresy.) One who is passing before the ark, as prayer leader, and erred, another should immediately pass in his place, and at that moment, this replacement should not refuse in the interest of courtesy. The Amida prayer was interrupted and he should replace him as quickly as possible. From where does the replacement commence? From the beginning of the blessing in which the former had erred.