Numbers 13:32-33
From Reconciling understandings of Scripture and Science
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KJV
32 And they brought up an evil report of the land which they had searched unto the children of Israel, saying, The land, through which we have gone to search it, is a land that eateth up the inhabitants thereof; and all the people that we saw in it are men of a great stature.
See at Genesis 6:4 — it seems the Nephilim survived the Flood.