Genesis 18:11 establishes Sarah was old and past childbearing — the very impossibility that makes her astonished question here so meaningful.

Genesis 18:12 records Sarah's private laughter of disbelief at the promise. Here her 'Who would have said?' echoes that laugh — now transformed from doubt into joyful wonder at God's fulfillment.

In Isaiah 49:21, Zion echoes Sarah's exact astonishment: 'Who has brought me these?' — a barren woman stunned by unexpected children, mirroring Sarah's bewilderment.

Proverbs 13:12 says 'hope deferred makes the heart sick, but a desire fulfilled is a tree of life.' After decades of barrenness, Sarah's wonder captures that fulfillment perfectly.