Page 148 - HTUNA

Rashi explains that Hashem counted Bnei Yisrael again at this point out
of His tremendous love for them. Bnei Yisrael were listed by name to
teach that a person’s name reveals his essence, and has the capacity to
influence him.
Torah study protects a person during the daytime and during the night.
But, when one is asleep at night, what will provide him protection? His
name, which has its source in kedushah, is what safeguards him. Yaakov
considered his sons’ names carefully before giving them.
When David Hamelech was in the bathhouse, he was greatly distressed,
for he found himself bare of mitzvot. Then he remembered his brit milah.
Why didn’t he have this fear when he visited the restroom? When one is
in the restroom, he still has the mitzvah of tzeniut, and he tries to cover
himself as much as possible. Maintaining these halachot protect him. In
the bathhouse, he is bereft of this mitzvah.