Yossi Horowitz
After Hashem answers Bnei Yisroels frenzied demands for water, the Torah tells us, "There (in Marah) He established for it (the nation) a decree and an ordinance and there He tested it" (15:25). The words "decree" and "ordinance" (chok u'mishpat) are explained in Mesechta Sanhedrin (56b) as a reference to three mitzvos which were given to the Jews at this time in Marah, prior to the giving of the Torah at Har Sinai. The three mitzvos are Shabbos, kibbud av v'eim, and establishing a judicial system.
The Ramban explains that these three mitzvos were introduced at this time to
accustom the Bnei Yisroel to the performance of mitzvos in anticipation of matan Torah. The test
at Marah ("sham nisahu"), continues the Ramban, was to see if the Jewish nation would accept
these mitzvos willingly and perform them joyfully.
Rav Boruch Halevi Epstein in his Torah Temimah complements the Ramban's idea
with a brilliant insight into our Nusach HaTefilla. Why, he asks, do we add the phrase "
bahava uvratzon" (with love and favor) in the Yom Tov Amidah and Kiddush only when Yom Tov
coincides with Shabbos? What is this added element of love that Yom Tov does not share with Shabbos?
The answer lies in the Gemara Shabbos (88a). Commenting on the verse, "And they
encamped underneath the mountain" (Shemos 19:17), the Gerara relates that at the moment of matan
Torah, G-d held Har Sinai over the heads of the Jewish nation, threatening to kill them if
they were to refuse the Torah. Bnei Yisroel thus accepted the mitzvos given at Har Sinai under
duress, against their collective will. However, the mitzvos accepted at Marah were accepted willingly
and with love, "bahava uvratzon". Thus, explains the Torah Temimah, it is fitting that
only on Shabbos do we add the phrase "bahava uvratzon", since Shabbos was accepted willingly,
while other mitzvos (e.g. Yom Tov) were imposed upon Bnei Yisroel.
Rav Yosef Shaul Natanson in Divrei Shaul suggests an additional
interpretation of the word "nisahu", traditionally understood to mean "He tested them." The word
"nisahu" may also be derived from the word "nes," a flag or banner. We must view the
mitzvos given to the Jewish Nation as a banner, that which separates and distinguishes us from all
other nations of the world. The realization that mitzvos should be performed with a sense of pride,
not embarrassment, coupled with the Rambans emphasis on the joy with which mitzvos should be observed,
should stir us to avoid the pitfalls of "mitzvas anashim milumada" (Isaiah 29:13)--the rote
performance of mitzvos.