פירוש על בראשית 1:15
Rashi on Genesis
והיו למאורות AND LET THEM BE FOR LIGHTS — They shall serve also this purpose, namely, to give light to the world.
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Rashbam on Genesis
והיו למאורות, they should provide light for the physical universe.
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Sforno on Genesis
להאיר על הארץ, they should dispense their light at a time when it is beneficial for the inhabitants of the earth.
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