These are the generations of the heavens and of the earth when they were created, in the day that the Lord God made the earth and the heavens.
Genesis 2:4
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In rabbinic conception, Adonai “Lord” represents the attribute of mercy, while Elohim “God” represents the attribute of justice. Both according to Genesis 2:4 were brought together at the making of heaven and earth.
Bialik & Ravnitzky, “The Book of Legends, Sefer Ha-Aggadah”