Deuteronomy 34:6

ויקבר אותו AND HE BURIED HIM — i.e. The Holy One, blessed be He, in His glory, buried him (Sotah 14a). R. Ishmael, however, said, It means: “He buried himself”. This (the word אותו) is one of the three cases of את with a pronominal suffix which R. Ishmael explained thus (as being reflexive and not accusative pronouns). Similar to it is: (Numbers 6:13; see Rashi thereon) “On the day when his naziritehood is fulfilled, he shall bring אותו”, i.e. he shall bring (present) himself. Similar to it is, (Leviticus 22:16) “And they will burden אותם with iniquity of trespass”. But did others burden them (the priests) with that iniquity? But the meaning is that they burdened themselves (Sifrei Bamidbar 32). מול בית פעור OPPOSITE BETH PEOR — His grave was prepared there ever since the six days of Creation, to atone for the incident regarding Peor (see Numbers 25) (Sotah 14a). This (Moses' grave) was one of the things that were created “between the twilights” on the eve of the Sabbath [in the week of the Creation] (Pirkei Avot 5:6; Pesachim 54a).

וַיִּקְבֹּ֨ר אֹת֤וֹ בַגַּי֙ בְּאֶ֣רֶץ מוֹאָ֔ב מ֖וּל בֵּ֣ית פְּע֑וֹר וְלֹא־יָדַ֥ע אִישׁ֙ אֶת־קְבֻ֣רָת֔וֹ עַ֖ד הַיּ֥וֹם הַזֶּֽה׃

And he buried him in the valley in the land of Mo᾽av, over against Bet-pe῾or: but no man knows his grave to this day.