Luke 11:26
Then it goes and takes with it seven other spirits, more evil than itself, and they reenter [the body] and [begin] to live there, so that the latter state of that person becomes worse than the former state."
John 5:14
Later on Jesus found the man in the Temple, and said to him, "Look, you have been made well; stop sinning or else something worse [i.e., than the handicap you had] will happen to you."
2 Peter 2:20-22
For if people who have escaped from the defiling practices of the world by coming to know our Lord and Savior Jesus Christ, become tangled up in them again, and are overcome by them, these people are worse off than before they were converted.
Matthew 12:45
Then it goes and takes with it seven other spirits, more evil than itself, and they reenter [the body] and [begin to] live there, so that the latter state of that person becomes worse than the former [state]. It will be the same way with the people of this evil generation."
Matthew 23:15
"It is too bad for you hypocritical experts in the law of Moses and [you] Pharisees! For you travel over land and sea [in hope of] making one person a proselyte [i.e., a convert to the Jewish religion]. And when you do convert one, you make him twice as deserving of hell as yourselves.
Hebrews 6:4-8
[These are people] who were once enlightened [by the Gospel message], who had experienced the gift from heaven [i.e., forgiveness, never ending life, etc. See Rom. 6:23], who had partaken of the Holy Spirit [See Acts 2:38],
Hebrews 10:26-31
For if we go on sinning intentionally, after we have received the full knowledge of the truth, there is no longer any sacrifice for [our] sins.
1 John 5:16
If anyone [of you] observes his brother [or sister] sinning [in a way that would not lead] to [spiritual] death, he should ask [God, in prayer, to help that person], and God will give him [spiritual] life, [that is], to such ones, provided their sin is not leading to [spiritual] death. There is such a sin that leads to [spiritual] death. [See Heb. 6:4-6; I Tim. 5:6; Heb. 10:26-27; II Pet. 2:20-22]. I am not suggesting that you should ask [God, in prayer] about such a situation.
Jude 1:12-13
These people are like rotten spots [contaminating the food] at your love feasts, while they gorge themselves without fear [i.e., unashamed of their selfish indulgence]. [Note: This passage may mean "like selfish shepherds, looking out only for themselves, they eat the grain set out for the animals"]. They are like clouds that blow over without producing rain; [they are like] trees in the fall that do not produce any fruit and have been uprooted, [thus] being dead twice [i.e., fruitless and rootless].