The Hebrew noun mivtach refers to the ground of one's confidence or trust — what one relies upon for security and hope. It comes from the root batach (H982, to trust/be confident) and describes the object or basis of trust.
Mivtach is where you place your weight. The Proverbs writer warns: 'Confidence (mivtach) in an unfaithful person in a time of trouble is like a bad tooth or a lame foot' (Proverbs 25:19). The prophets consistently challenge Israel to examine their mivtach: Are they trusting in Egypt's horses (Isaiah 30:2-3) or in the living God? The Psalms declare that God alone is true mivtach (Psalm 40:4; 65:5). This word calls us to examine the foundations of our security — and to anchor our trust only where it will hold.