Rebbi says: (The thrust of "your [singular] G–d") is to apprise us of the eminence of Israel, that when they all stood at Mount Sinai to receive the Torah, they were all of one heart, to receive the kingdom of Heaven with joy. And, what is more, they all stood security for each other (for observance of the mitzvot (commandments)h.) And not only over what was revealed alone did the Holy One Blessed be He appear to them (in Arvoth Moav, viz. Devarim 29:9) to forge a covenant with them, but even over what was concealed, as it is written (Devarim 29:28) "What is hidden (is known to) the L–rd our G–d, and what is revealed is for us and for our children forever"—this, by way of saying: Over what is revealed we will enter into a covenant with you, but not over what is concealed, so that one not sin in secret and the congregation be bound thereby.