וְאַתָּ֞ה דַּבֵּ֨ר אֶל־בְּנֵ֤י יִשְׂרָאֵל֙ לֵאמֹ֔ר אַ֥ךְ אֶת־שַׁבְּתֹתַ֖י תִּשְׁמֹ֑רוּ כִּי֩ א֨וֹת הִ֜וא בֵּינִ֤י וּבֵֽינֵיכֶם֙ לְדֹרֹ֣תֵיכֶ֔ם לָדַ֕עַת כִּ֛י אֲנִ֥י יְהוָ֖ה מְקַדִּשְׁכֶֽם׃
Dan engkau, katakanlah kepada orang Israel: Namun, hari-hari Sabat-Ku harus kamu pelihara, sebab itulah tanda antara Aku dan kamu turun-temurun, supaya diketahui bahwa Akulah Yang Mahakekal yang menguduskan kamu.
Sha'arei Orah
However, on Shabbat and Holidays prescribed by Torah, the donning of phylacteries-Tefillin is not necessary. This is because, on those days, there are several other wondrously great matters and all the gates are open. This is analogous to the fact that when a person has the king himself, he has no need for the king’s signet. Thus, Shabbat and the Holidays, which themselves are called a “sign-Ot-אות,”198Exodus 31:13 and elsewhere. are sufficient, so that on those days we do not need to199Deuteronomy 6:8 “bind them as a sign-Ot-אות.”