The giants, the sons of Anak, which come of the giants, אֶת־הַנְּפִילים בְּנִי עַנָק מִן־הַנְּפִלים. The Nephilim, Beni-Anak, of the Nephilim. The Septuagint has only τοὺς γίγαντας. The Nephilim are, without doubt, the primaeval tyrants mentioned under that name in Genesis 6:4. The renown of these sons of violence had come down from those dim ages, and the exaggerated fears of the spies saw them revived in the gigantic forms of the Beni-Anak. There is no certainty that the Nephilim had been giants, and no likelihood whatever that the Beni-Anak had any real connection with them. As grasshoppers. We have no means of judging of the actual size of these men, unless the height assigned to Goliath (six cubits and a span) be allowed to them. Probably men of this stature were quite exceptional even among the Anakim. The report of the spies was thoroughly false in effect, although founded on isolated facts.
Numbers
Numbers 13 - numbers-13 - worlddic.com