Anochi Hashem Elokecha -- even if only one individual gets the message

Rashi explains that the first of the Aseres Hadibros, “Anochi Hashem Elokecha…,” is written in the singular, as if Hashem was speaking only to Moshe, so that Moshe would have an argument in Bnei Yisrael’s defense when they sinned in the cheit ha’eigel and be able to claim the command was given only to him.

Of course the mitzvah of “Anochi Hashem Elokecha…” was given to all of Klal Yisrael.  What Rashi means, explains the Sefas Emes, is that the singular tense is used to show that even if an entire generation has sinned, so long as there is even one individual who does what’s right, Torah still has meaning.