Rashi on Deuteronomy 28:30/רש"י על דברים כ״ח:ל׳

1ישגלנה is connected in meaning with the noun שגל, a concubine; Scripture, however, paraphrases it by using a more decent, expression, viz., ישכבנה (i.e. the קרי is ישכבנה). This is a variation such as writers make to avoid an indecent expression (Megillah 25b; cf. Rashi on Genesis 18:22 and Note p. 266).

2תחללנו THOU SHALT NOT MAKE IT חולין in the fourth year so as to be able to eat its fruits (cf. Rashi on Deuteronomy 20:6).