There are many more where this came from.
"The Bible begins with the Scripture, "In the beginning God created the Heavens and the Earth" GEN 1:1 . The Bible then goes on to describe how God took six days to finish His creation. The word "day" in Hebrew is yom and can mean the daylight portion of a day, 24 hours or an unspecified period of time.
So there are three possible meanings for the word day to choose from. Which then would be appropriate for the context of the passage? It is clear that the context should specify the meaning of the Hebrew word YOM. The context tells us that there was a time period of an "evening and morning".The word day is also used with a number and when it is used with a number it means it is a 24 hour day. Another Scripture in Exodus 20:8-20:11 tells us what the meaning of the Hebrew word YOM we should choose.
Exo 20:8 Remember the sabbath day, to keep it holy.
Exo 20:9 Six days shalt thou labour, and do all thy work:
Exo 20:10 But the seventh day is the sabbath of the LORD thy God: in it thou shalt not do any work, thou, nor thy son, nor thy daughter, thy manservant, nor thy maidservant, nor thy cattle, nor thy stranger that is within thy gates:
Exo 20:11 For in six days the LORD made heaven and earth, the sea, and all that in them is, and rested the seventh day: wherefore the LORD blessed the sabbath day, and hallowed it.
Each word translated DAY in these verses is the same Hebrew word - YOM. If there was any opportunity for the writer to distinguish between the shades of meaning of the Hebrew word YOM it would be here. As we can see no attempt is made by the writer to show a difference in the word. In fact what the verses do show is the same meaning for us and for God. God tells us to labour for six days just like He laboured for six days and to rest on the seventh day just like He rested on the seventh day. So these Scriptures prove that the length of a day (yom) at creation is the same as our day."
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