'Eternal' in the Bible

If your hand or your foot causes you to sin, cut it off and throw it away. It is better for you to enter life crippled or lame than to have two hands or two feet and be thrown into eternal fire.

Now someone came up to him and said, "Teacher, what good thing must I do to gain eternal life?"

And whoever has left houses or brothers or sisters or father or mother or children or fields for my sake will receive a hundred times as much and will inherit eternal life.

"Then he will say to those on his left, 'Depart from me, you accursed, into the eternal fire that has been prepared for the devil and his angels!

And these will depart into eternal punishment, but the righteous into eternal life."