Bereshis 26:4-5

And I will make thy zera to multiply as the kokhavim of Shomayim, and will give unto thy zera all these lands; and in thy zera shall kol Goyei Ha'Aretz be blessed; Because Avraham obeyed My voice, and was shomer over My mishmeret (charge), My mitzvot, My chukkot, and My torot.