Our Parsha Nitzavim sets the tone for the final doubleheader parshiyot by opening with Moshe Rabbeinu addressing the B’nai Yisrael on the final day of his life:
“Atem Nitzavim HaYom… You are standing today, all of you, before Hashem, your G’d…. for you to pass into the convenant of Hashem, …that Hashem… seals with you today in order to establish you as a people to Him and that He be a G’d to you as He spoke to you and as He swore to your forefathers, to Avraham, to Yitzchak and to Yaakov.” (Artscroll Stone Edition Chumash, Sefer Devarim Perek 29, posukim 9-13)