They have sharpened their tongues like a serpent - Compare the notes at Psalm 64:3. The idea here is, that since the tongue of the serpent “seems” to be sharp, pointed, adapted to penetrate (and probably the original reference in the image was derived from that idea), the wound inflicted is by the serpent‘s tongue - “as if” with a hard, penetrating point. It is now known, however, that it is by a tooth - a single tooth, made flexible for the purpose - at the root of which a small bag containing the poison is located, which is injected through an orifice in the tooth into the wound. The meaning here is, that the words spoken by such persons - by their tongues - were like the poison produced by the bite of a serpent.
Adders‘ poison is under their lips - The asp or adder is among the most poisonous of serpents. Thus, Cleopatra of Egypt is said to have destroyed her own life by an asp, which she had concealed for that purpose. This passage is quoted in Romans 3:13, as a proof of human depravity. See the notes at that verse.
Principle, Not Policy, Must Control—Had the Israelites preserved a clear perception of right and wrong, they would have seen the fallacy of Abimelech's reasoning, and the injustice of his claims. They would have seen that he was filled with envy, and actuated by a base ambition to exalt himself by the ruin of his brethren. Those who are controlled by policy rather than by principle are not to be trusted. They will pervert the truth, conceal facts, and construe the words of others to mean that which was never intended. They will employ flattering words, while the poison of asps is under their tongue. He who does not earnestly seek the divine guidance will be deceived by their smooth words and their artful plans (The Signs of the Times, August 4, 1881). 2BC 1005.1
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