Halakhah sobre Exodo 15:2

The Gemara (Chullin 5a) categorizes Jews who publicly desecrate Shabbat as nochrim. While Shabbat violators remain Jews, as the Gemara (Sanhedrin 44a) famously proclaims, “He remains a Jew even if he sins,” Rav Yosef Dov Soloveitchik (cited in Nefesh Harav p. 282) explains that Sabbath violators are missing an aspect of kedushat Yisrael (the holiness of a Jew). Rav Soloveitchik notes that Shemot 15:2 refers to Hashem as “my God” and “my father’s God.” Rashi (ad. loc. s.v. Elokei Avi) explains that one’s connection to Hashem began with one’s forefathers, and the individual continues that holy status. The Sabbath violator remains Jewish by virtue of his ancestry, but the aspect of holiness of a Jew that emerges from one’s accepting Hashem as one’s own God is missing from a Jew who publicly desecrates one of the most basic laws of the Torah, Shabbat observance.

Of course, in the performance of mizvot not all that is permissible is optimal. The Sages interpret Exodus 15:2 as an exhortation to perform mizvot in as beautiful and aesthetic a manner as possible.⁷See also R. Moshe Stern, Teshuvot Be’er Mosheh, III, no. 55, and R. Benjamin Silber, Oz Nidberu, VI, no. 48, and hashmattot, pp. 144-145.

It's taught in Sanhedrin 42a: "And Rabbi Aḥa bar Ḥanina says that Rabbi Asi says that Rabbi Yoḥanan says: With regard to anyone who blesses the new month in its proper time, it is as if he greets the Face of the Divine Presence. Alluding to this, it is written here concerning the sanctification of the new month: “This month shall be for you the beginning of months” (Exodus 12:2), and it is written there, where the Jewish people encountered the Divine Presence at the splitting of the sea: “This is my God and I will glorify Him” (Exodus 15:2). The term “this” is employed in both verses. The school of Rabbi Yishmael taught: If the Jewish people merited to greet the Face of their Father in Heaven only one time each and every month, it would suffice for them, since in the blessing of the moon there is an aspect of greeting the Divine Presence. Abaye said: Therefore, we will say the blessing while standing, in honor of the Divine Presence." Behond it's clear that sanctification of the moon is a great and terrible matter like greeting the Shechina. And certainly there are great and terrible secrets regarding it, as the wise receivers of tradition have elaborated: the matter of the moon's diminishing and the matter of the First Man's sin, they touch one another. In the future, when the First Man's sin is rectified - then the diminishing of the moon will also be rectified. And regarding that moment it is said "And the light of the moon will be like the light of the sun" (Isaiah 30:26).