The Hebrew word ayin (אַיִן) denotes absolute non-existence, nothingness, or absence. It functions as a particle of negation meaning 'there is not,' 'nothing,' or 'without.' It appears over 700 times in the Old Testament.
In Hebrew thought, ayin stands in sharp contrast to yesh (there is). It underscores the absolute sovereignty of God — before creation there was nothing, and apart from God all things return to nothing. Theologically, it grounds the doctrine of creatio ex nihilo. Isaiah uses it powerfully to describe idols: they are nothing, vanity, and emptiness (Isaiah 41:24). In contrast, God alone has true and eternal being. Ayin also expresses the depth of human desperation — when Israel had nothing left, God became everything (Lamentations 1:2).