בChelek 2
- Leave over some bead to show Hashem’s bountiful generosity. If there are poor who could collect the leftovers, make sure that the pieces are sizable. (MB – ShaH3)
- The left-over bread should be kept on the table for Birkas Hamazon. (ShA )
- If there is no bread left, other bread should be brought to the table. However, do not bring more bread if there is bread left. (ShA – MB )
- It is forbidden to ruin chunks of bread that are k’zayis or larger. Less than that size can be thrown into the water – just don’t step on them because it can cause poverty. Some are machmir that a kezayis-worth of bread crumbs combine and therefore shouldn’t be ruined. (ShA – MB )
- Before washing mayim achronim at the table, you must gather the leftover (k’zaysim) bread to one end so no water will splash onto the bread. (MB )
- Remove the knife from the table for Birkas Hamazon except on Shabbos and Yom Tov. (ShA – MB ) LAWS OF BIRKAS HAMAZON