And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day.
From the first day of creation in the Genesis account.
Genesis 1:5
King James Version (public domain)
Traditionally attributed to Moses · c. 13th century BC · The Pentateuch — Genesis, Exodus, Leviticus, Numbers, and Deuteronomy — is traditionally attributed to him
Context
3And God said, Let there be light: and there was light.
4And God saw the light, that it was good: and God divided the light from the darkness.
5And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day.
6And God said, Let there be a firmament in the midst of the waters, and let it divide the waters from the waters.
7And God made the firmament, and divided the waters which were under the firmament from the waters which were above the firmament: and it was so.