Why does the Torah insert "Ki Li b'nei Yisrael Avadim"?
Rashi: To explain to the Nochri that Hashem's document of sale (purchasing Yisrael as Avadim) preceded his.
Ramban (on Pasuk 47): Even though the Nochri is not subject to the laws of Yovel, they do not have the authority to buy Hashem's servants as slaves.
Targum Yonasan: Yisrael are Hashem's Avadim in that they are subservient to His Torah, and may not be enslaved by others. 1
See Na'ar Yonasan.
Why does the Torah insert "Ani Hashem Elokeichem"?