Genesis 1:14
14 God said, “Let there be lights in the expanse of the sky to separate the day from the night, and let them be signs to indicate seasons and days and years, 15 and let them serve as lights in the expanse of the sky to give light on the earth.” It was so. 16 God made two great lights—the greater light to rule over the day and the lesser light to rule over the night. He made the stars also. 17 God placed the lights in the expanse of the sky to shine on the earth, 18 to preside over the day and the night, and to separate the light from the darkness. God saw that it was good.
Leviticus 10:10
9 “Do not drink wine or strong drink, you and your sons with you, when you enter into the Meeting Tent, so that you do not die. This is a perpetual statute throughout your generations, 10 as well as to distinguish between the holy and the common, and between the unclean and the clean, 11 and to teach the Israelites all the statutes that the Lord has spoken to them through Moses.”
Notes and References
"... “to separate” + “between” (Genesis 1:14, 18; Leviticus 11:47) ... occurs twenty-one times in the Pentateuch and a further eleven times throughout the remainder of the Old Testament. However, the hiphil infinitive construction, used in conjunction with the preposition occurs only five times. In Genesis 1, a fivefold use of לדב (hiphil) emphasizes the importance of separation as a divine act of creation. The infinitive construction appears twice as “luminaries” (תראמ) are appointed “to separate” (לידבהל) “between the day and the night” (1:14) and “between the light and the darkness” (1:18). In Leviticus 10:10, לדב (hiphil infinitive construction) + ןיב is used to demarcate one of the priesthood’s central functions. Aaron and his descendants are commanded “to separate between the holy and the common and between the unclean and the clean”. Thus, “to separate between” constitutes a core cultic activity ..."
Harper, G. Geoffrey "I Will Walk among You": The Rhetorical Function of Allusion to Genesis 1-3 in the Book of Leviticus (p. 180) Eisenbrauns, 2018