Treasury of Scripture Knowledge

Summary

Unto the pure all things are pure: but unto them that are defiled and unbelieving is nothing pure; but even their mind and conscience is defiled.

Bible References

The pure

And the Lord said to him, "Now do ye, O Pharisees, make clean the outside of the cup, and of the platter: but your inward parts are full of ravening and wickedness.
And the voice spake unto him again the second time, "What God hath cleansed that make thou not common."
For I know, and am full certified in the Lord Jesus, that there is nothing common of itself: but unto him that judgeth it to be common, to him it is common.
All things are lawful unto me: but all things are not profitable. I may do all things: but I will be brought under no man's power.
All things are lawful unto me, but all things are not expedient. All things are lawful to me, but all things edify not.
forbidding to marry, and commanding to abstain from meats, which God hath created to be received with giving thanks, of them which believe, and know the truth.

Their

But every man hath not knowledge. For some suppose that there is an idol, until this hour, and eat as of a thing offered unto the idol, and so their consciences being yet weak are defiled.
How much more shall the blood of Christ - which through the eternal spirit, offered himself without spot to God - purge your consciences from dead works, for to serve the living God?
let us draw nigh with a true heart in a full faith sprinkled in our hearts, from an evil conscience, and washed in our bodies with pure water,

General references

The flesh that toucheth any unclean thing shall not be eaten, but burnt with fire: and all that be clean in their flesh, may eat flesh.
that ye may put difference between holy and unholy, and between unclean and clean,
All manner meat that is eaten, if any such water come upon it, it shall be unclean. And all manner drink that is drunk in all manner such vessels, shall be unclean.
Ye shall eat no manner of abomination.
And therefore study I to have a clear conscience toward God, and toward man also.
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American Bible Union New Testament
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Bible in Basic English
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Webster
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Youngs Literal Translation