The Hebrew sheqer means falsehood, deception, a lie, or anything false and without foundation. It is the most common Hebrew word for lying, often appearing in legal and wisdom contexts as the antithesis of emet (truth) and tsedek (righteousness).
Sheqer is not merely factual inaccuracy — it is the corruption of reality for self-serving purposes. The Ninth Commandment ('You shall not give false testimony against your neighbor,' Exodus 20:16) uses the language of sheqer, situating it as a fundamental breach of the covenant community. The prophets invoke it to describe the fraudulent prophets who cry 'Peace! Peace!' when there is no peace (Jeremiah 8:11) — the ultimate spiritual sheqer. Proverbs systematically contrasts the sheqer-speaker with the righteous: 'A lying tongue hates those it hurts' (Proverbs 26:28). Theologically, sheqer is the native language of the enemy (John 8:44 — the devil is 'the father of lies'), while God is the God of emet — truth, faithfulness, and reality. The Gospel is the ultimate emet that exposes every sheqer.