Our responsibility for each other

Hi,

"The Torah says, ‘That which is hidden is for HaShem, our Gd, and that which is revealed is for us and our descendants eternally.’ In this sentence, in a Torah scroll, why are there dots atop לנו ולבנינו and over the ע in עד?

"R’ Yehudah explained: To teach that HaShem did not punish for hidden sin until the Jews crossed the Yarden.

"R’ Nechemyah asked: Does Gd ever punish for that which is hidden?! The sentence says [that Gd does not punish for hidden sin] ‘eternally!’ Rather, just as Gd did not punish for hidden sin (until then), so Gd did not punish for open sin until the Jews crossed the Yarden River."

(Talmud, Sanhedrin 43b)

Have a great day,
Mordechai