https://www.sefaria.org/Shulchan_Arukh,_Orach_Chayim.475.7
Shulchan Arukh, Orach Chayim 475:7 | Sefaria Library
The obligation to eat matza only applies on the first night. Rema: And the custom is to make the three Seder matzot out of an issaron of flour, as a...
shulchan arukhorach chayim475 7sefarialibrary