But Jesus said unto him, No man, having put his hand to the plow, and looking back, is fit for the kingdom of God.
Mark 8: 36 - 38
For what doth it profit a man, to gain the whole world, and forfeit his life? 37 For what should a man give in exchange for his life? 38 For whosoever shall be ashamed of me and of my words in this adulterous and sinful generation, the Son of man also shall be ashamed of him, when he cometh in the glory of his Father with the holy angels.
Luke 17: 32
Remember Lot's wife.
2 Pet 2: 20, 21
For if, after they have escaped the defilements of the world through the knowledge of the Lord and Saviour Jesus Christ, they are again entangled therein and overcome, the last state is become worse with them than the first. For it were better for them not to have known the way of righteousness, than, after knowing it, to turn back from the holy commandment delivered unto them.
Ezra 8: 22 b
The hand of our God is upon all them that seek him, for good; but his power and his wrath is against all them that forsake him.
Gal 5: 1
For freedom did Christ set us free: stand fast therefore, and be not entangled again in a yoke of bondage.
Rev 3: 11 b
Hold fast that which thou hast, that no one take thy crown.
Heb 11: 15, 16
And if indeed they had been mindful of that country from which they went out, they would have had opportunity to return. 16 But now they desire a better country, that is, a heavenly: wherefore God is not ashamed of them, to be called their God; for he hath prepared for them a city.
Dan 12: 2
And many of them that sleep in the dust of the earth shall awake, some to everlasting life, and some to shame and everlasting contempt