However, a verse from the Psalms does not refer to a 24-hour day:
They who dwell in the ends of the earth stand in awe of Your signs; You make the dawn [boqer] and the sunset [ereb] shout for joy. (Psalm 65:8)
Moses, the author of Genesis 1, also wrote Psalm 90.7 In this Psalm, Moses compares 1000 years to a single day or a watch in the night.8 In the next verse, he compares human lives to grass. He says that the grass sprouts in the morning and withers in the evening. Realistically, grasses live at least several days or weeks before dying. Evening and morning in this example do not refer to a 24-hour period of time:
You have swept them away like a flood, they fall asleep; In the morning [boqer] they are like grass which sprouts anew. In the morning [boqer] it flourishes and sprouts anew; Toward evening [ereb] it fades and withers away. (Psalm 90:5-6)
Later, in the same Psalm, Moses includes a plea that God satisfy us with His love in the morning (boqer) that we may sing all our days (a lifetime of days, again, is usually longer than 24 hours):
O satisfy us in the morning [boqer] with Your lovingkindness, That we may sing for joy and be glad all our days [yom]. (Psalm 90:14)
Another verse, from Daniel, refers to a period of prophecy:
He said to me, "For 2,300 evenings [ereb] and mornings [boqer]; then the holy place will be properly restored." (Daniel 8:14)
Some interpret the period of 2,300 evenings and mornings as 2,300 days, while other calculate it as 1,150 days (2,300 divided by 2).9 Still others interpret the 2,300 evenings and mornings as 2,300 years.10 It is not absolutely clear that the reference is to 24-hour days.
None of these verses mention yom.
Outside Genesis 1, yom occurs only 4 times in combination with both Hebrew words for "evening" and "morning." The actual word order of "evening" followed by "morning" in combination with yom (as seen in Genesis 1) occurs only once outside Genesis 1. It is ironic that this one verse comes from Daniel 8:26, which defines yom as a period of time at least 3000 years long:
"The vision of the evenings [ereb] and mornings [boqer] Which has been told is true; But keep the vision secret, For it pertains to many days [yom] in the future." (Daniel 8:26)
How do you get the "3000 years" out of this statement?
Mt. Olive Lutheran (LCMS)