Matzah sold as Shmurah means that Jews were present from the time of harvesting, making sure that the grain stayed dry and didn't become chametz, and intending for the purpose of the mitzva of matzah. ...
According to those who hold that there is a Kiyyum Mitzvath 'Aseh DeOraitha (a fulfillment of a positive Biblical commandment) every time one eats a KeZayith (olive size's worth) of Matzah on Pesaḥ, ...
Historically, when did the Ashkenazi custom to not bake matza on Pesach start? I am specifically interested in when this custom arose, rather than the reasons/opions pro/against.
As DoubleAA has reminded me, the Mishna in Pesachim 2:5 forbids the usage of matzah that is tevel or heqdesh on the evening of Pesach. In his commentary on Nedarim 2:2, however, the Bartenura appears ...