Genesis 1:4
1 In the beginning God created the heavens and the earth. 2 Now the earth was without shape and empty, and darkness was over the surface of the watery deep, but the Spirit of God was hovering11 over the surface of the water. 3 God said, “Let there be light.” And there was light! 4 God saw that the light was good, so God separated the light from the darkness. 5 God called the light “day” and the darkness “night.” There was evening, and there was morning, marking the first day.
Exodus 26:33
32 You are to hang it with gold hooks on four posts of acacia wood overlaid with gold, set in four silver bases. 33 You are to hang this curtain under the clasps and bring the ark of the testimony in there behind the curtain. The curtain will make a division for you between the Holy Place and the Most Holy Place. 34 You are to put the atonement lid on the ark of the testimony in the Most Holy Place.
Leviticus 20:24
23 You must not walk in the statutes of the nations which I am about to drive out before you, because they have done all these things and I am filled with disgust against them. 24 So I have said to you: You yourselves will possess their land and I myself will give it to you for a possession, a land flowing with milk and honey. I am the Lord your God who has set you apart from the other peoples. 25 Therefore you must distinguish between the clean animal and the unclean, and between the unclean bird and the clean, and you must not make yourselves detestable by means of an animal or bird or anything that creeps on the ground—creatures I have distinguished for you as unclean.
Notes and References
"... Within the Pentateuch, “separation” is also an important cultic term. Appropriate “separation” is to be made in relation to space (Exodus 26:33; compare Ezekiel 42:20), impurity (Leviticus 20:25), and people groups (Leviticus 20:24, 26; Numbers 8:14; 16:9; Deuteronomy 10:8). In fact, making correct divisions is viewed as being integral to the function of the priests who are commissioned “to separate between the holy and the common and between the unclean and the clean” (Leviticus 10:10). Thus, in Leviticus 11–15, the priests, and by extension the people as a whole, are to order their world through acts of separation. The conceptual parallel between God’s ordering of the cosmos and Israel’s (re)ordering of its environs is strengthened by the rare syntactical formulation involving לדב that links Genesis 1 to Leviticus 10:10 and 11:47 (see above). A correlation, or even analogy, between creation and cult is implied ..."
Harper, G. Geoffrey "I Will Walk among You": The Rhetorical Function of Allusion to Genesis 1-3 in the Book of Leviticus (pp. 193-194) Eisenbrauns, 2018