Rashi on Deuteronomy 11:26/רש"י על דברים י״א:כ״ו

1ראה אנכי ... ברכה וקללה BEHOLD I [SET BEFORE YOU THIS DAY] A BLESSING AND A CURSE — those which are later to be recited on Mount Gerizim and on Mount Ebal respectively (cf. v. 29).