Goliath and his gigantic brothers
were thought to be surviving Nephilim
Now giants were upon the earth in those days. For after the sons of God went in to the daughters of men, and they brought forth children, these are the mighty men of old, men of renown. And God seeing that the wickedness of men was great on the earth, and that all the thought of their heart was bent upon evil at all times, it repented him that he had made man on the earth. And being touched inwardly with sorrow of heart, He said: I will destroy man, whom I have created, from the face of the earth, from man even to beasts, from the creeping thing even to the fowls of the air, for it repenteth me that I have made them. (Genesis 6:4-7)
1 And all the others together with them took unto themselves wives, and each chose for himself one, and they began to go in unto them and to defile themselves with them, and they taught them charms 2 and enchantments, and the cutting of roots, and made them acquainted with plants. And they 3 became pregnant, and they bare great giants, whose height was three thousand ells: Who consumed 4 all the acquisitions of men. And when men could no longer sustain them, the giants turned against 5 them and devoured mankind. And they began to sin against birds, and beasts, and reptiles, and 6 fish, and to devour one another’s flesh, and drink the blood. Then the earth laid accusation against the lawless ones.
Now back to the Bible:
But these men blaspheme whatever things they know not: and what things soever they naturally know, like dumb beasts, in these they are corrupted. Woe unto them! For they have gone in the way of Cain: and after the error of Balaam they have for reward poured out themselves and have perished in the contradiction of Core. These are spots in their banquets, feasting together without fear, feeding themselves: clouds without water, which are carried about by winds: trees of the autumn, unfruitful, twice dead, plucked up by the roots: Raging waves of the sea, foaming out their own confusion: wandering stars, to whom the storm of darkness is reserved for ever. Now of these Enoch also, the seventh from Adam, prophesied, saying: Behold, the Lord cometh with thousands of his saints: To execute judgment upon all and to reprove all the ungodly for all the works of their ungodliness, whereby they have done ungodly: and for all the hard things which ungodly sinners have spoken against God. These are murmurers, full of complaints, walking according to their own desires: and their mouth speaketh proud things, admiring persons, for gain’s sake. (Jude 1:10-16)