Rashi on Leviticus 26:26/רש"י על ויקרא כ״ו:כ״ו

1מטה לחם THE STAFF OF YOUR BREAD: מַטֵּה — This expression denotes [a source of] “support”, similar to “staff (מַטֵּה) of strength” (Jeremiah 48:17).

2בשברי לכם מטה לחם WHEN I BREAK THE STAFF OF YOUR BREAD — This implies: “I will break for you every support of food”. These are the “arrows of famine” alluded to by Ezekiel (5:16), for he continues with exactly the same words: “and I will break your staff of bread” (cf. Sifra, Bechukotai, Chapter 6 2).

3בתנור אחד [TEN WOMEN SHALL BREAK YOUR BREAD] IN ONE OVEN — on account of scarcity of wood (fuel) (Sifra, Bechukotai, Chapter 6 2).

4והשיבו לחמכם במשקל AND THEY SHALL DELIVER YOUR OWN BREAD AGAIN BY WEIGHT, because the grain will rot and the bread will become פת נפולת (crumbly bread) and break into pieces in the oven, so that they (the women) will deliberately weigh the pieces in order to divide them between themselves (Sifra, Bechukotai, Chapter 6 2).

5ואכלתם ולא תשבעו AND YE SHALL EAT AND NOT BE SATISFIED — This is a special curse that will take effect on the bread already in their stomach (Sifra, Bechukotai, Chapter 6 2; cf. Rashi on v. 5). Thus you have seven punishments (alluded to in v. 24): (1) the attacking armies, (2) the siege, (3) the plague, (4) the destruction of food supply, (5) a lack of wood, (6) crumbly bread and (7) a curse in the intestines.