Just a verse I have posted umpteen times:
1 Jn 1:7 But if we walk in the light, as he is in the light, we have fellowship one with another, and the blood of Jesus Christ his Son cleanseth us from all sin.
A continued walking in the light by the Christian is required to have a continued cleansing away of all sins by the blood of Christ.
So the Christians' salvation (having all sins washed away) is CONDITIONAL (see the word 'if") the Christian continues (present tense) walking in the light.
Also 1 Jn 1:9 If we confess our sins, he is faithful and just to forgive us oursins, and to cleanse us from all unrighteousness.
See the CONDITIONAL word "IF" again?
It is a logical fallacy of denying the antecedent to make your claim on 1 John 1:7.
1 John 1:7 says nothing about what happens if one doesn't walk in the light.
The verse also never says "salvation" or "eternal life."
You also cannot prove that "And the blood . . ." depends on the if. You may start a new sentence with "And the blood."
Also you cannot prove that this is anything other than cleansing the conscience from dead works, or that it is the foot washing a disciple needs whose totality has been cleansed.
"For if the blood of goats and bulls, and the ashes of a heifer sprinkling them that have been defiled, sanctify unto the cleanness of the flesh: how much more shall the blood of Christ, who through the eternal Spirit offered himself without blemish unto God, cleanse your conscience from dead works to serve the living God?"
You may have scruples that need cleansing.
Of course Christians generally have daily need to confess sins and be cleansed (foot-washing). But the Christian does not daily lose his salvation.
Those verses do not say "salvation," lose salvation, nor eternal life.
You make unnecessary interpretations of verses which don't use that language, and ignore the plain teaching of the Word.
"never perish."
John 5:24
Truly, truly, I say to you, whoever hears my word and believes him who sent me has eternal life. He does not come into judgment, but has passed from death to life.
2 Corinthians 1:22
And who has also put his seal on us and given us his Spirit in our hearts as a guarantee.
OVER AND OVER AGAIN, SIMPLE FAITH IN THE LORD JESUS BRINGS SALVATION (not a shot at salvation)
JOHN 20:30
Many other signs therefore did Jesus in the presence of the disciples, which are not written in this book:
31 but these are written, that ye may believe that Jesus is the Christ, the Son of God; and that believing ye may have life in his name.
Act 13:48
And as the Gentiles heard this, they were glad, and glorified the word of God: and as many as were ordained to eternal life believed.
Faithful is the saying, and worthy of all acceptation, that Christ Jesus came into the world to save sinners; of whom I am chief:
16 howbeit for this cause I obtained mercy, that in me as chief might Jesus Christ show forth all his longsuffering, for an ensample of them that should thereafter believe on him unto eternal life.
1 Tim 1:15-17
Faithful is the saying, and worthy of all acceptation, that Christ Jesus came into the world to save sinners; of whom I am chief: howbeit for this cause I obtained mercy, that in me as chief might Jesus Christ show forth all his longsuffering, for an ensample of them that should thereafter believe on him unto eternal life.