Matthew 7:6
"Give not that which is holy unto the dogs, neither cast ye your pearls before swine, lest they trample them under their feet, and turn again and rend you."
Cross References (ranked by relevance)
Speak not in the ears of a fool: for he will despise the wisdom of thy words.
As a dog returneth to his vomit, so a fool returneth to his folly.
But he answered and said, It is not meet to take the children’s bread, and to cast it to dogs.
Of how much sorer punishment, suppose ye, shall he be thought worthy, who hath trodden under foot the Son of God, and hath counted the blood of the covenant, wherewith he was sanctified, an unholy thing, and hath done despite unto the Spirit of grace?
Beware of dogs, beware of evil workers, beware of the concision.
But it is happened unto them according to the true proverb, The dog is turned to his own vomit again; and the sow that was washed to her wallowing in the mire.
As a jewel of gold in a swine’s snout, so is a fair woman which is without discretion.
And then shall many be offended, and shall betray one another, and shall hate one another.
If they shall fall away, to renew them again unto repentance; seeing they crucify to themselves the Son of God afresh, and put him to an open shame.
In journeyings often, in perils of waters, in perils of robbers, in perils by mine own countrymen, in perils by the heathen, in perils in the city, in perils in the wilderness, in perils in the sea, in perils among false brethren;