Tafsiran Ulangan 4:6: Rashi, Sforno, Tur HaArokh & Rabbeinu Bahya

וּשְׁמַרְתֶּם֮ וַעֲשִׂיתֶם֒ כִּ֣י הִ֤וא חָכְמַתְכֶם֙ וּבִ֣ינַתְכֶ֔ם לְעֵינֵ֖י הָעַמִּ֑ים אֲשֶׁ֣ר יִשְׁמְע֗וּן אֵ֚ת כָּל־הַחֻקִּ֣ים הָאֵ֔לֶּה וְאָמְר֗וּ רַ֚ק עַם־חָכָ֣ם וְנָב֔וֹן הַגּ֥וֹי הַגָּד֖וֹל הַזֶּֽה׃

Jadi, peliharalah dan lakukanlah semuanya itu, sebab itulah hikmat dan pengertianmu di mata bangsa-bangsa. Apabila mereka mendengar segala ketetapan ini, mereka akan berkata: “Sungguh, bangsa yang besar ini adalah umat yang bijaksana dan berpengertian.”

Rashi

ושמרתם AND YE SHALL BE ON THE WATCH [TO DO] — This refers to the study of the laws (Sifrei Devarim 58),
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Sforno

כי היא חכמתכם, observance of the laws of the Torah is your true wisdom and will enable you to resist the lures and challenges by the heretics.
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Tur HaArokh

ושמרתם ועשיתם כי היא חכמתכם ובינתכם לעיני העמים, “observe them for in the eyes of the nations this group of laws represents your wisdom and your insight.” Moses points out that apart from the internal value of the laws of the Torah, they have an “external” value, if performed; the success of a Torah observant Jewish nation is credited to our wisdom, which in turn is credited by the nations to these laws, observance of which is perceived as the key to the success of the Jewish nation. An additional benefit accruing to the people for observing the Torah’s laws is that the Shechinah, Hashem’s benevolent presence, will be hovering over us, always close at hand when we need to call upon Him for any legitimate reason.
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Rashi

ועשיתם — this must be explained according to what it implies: AND YE SHALL DO.
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