“As those lights of heaven that we see have been set "for signs and seasons and days and years," that they might give light from the firmament of heaven to those who are on the earth, so also Christ, illuminating his church, gives signs by his precepts, that one might know how, when the sign has been received, to escap…”
Origen of Alexandria, 3th c. — HOMILIES ON GENESIS 1.6
Original
17And God set them in the firmament of the heaven to give light upon the earth,
Modern
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In context
15And let them be for lights in the firmament of the heaven to give light upon the earth: and it was so.
16And God made two great lights; the greater light to rule the day, and the lesser light to rule the night: he made the stars also.
— Genesis 1:17 —
18And to rule over the day and over the night, and to divide the light from the darkness: and God saw that it was good.
19And the evening and the morning were the fourth day.