لا يحتمل السقوط مثل الإيمان بالله تعالى
The duty that does not admit lapse is illustrated by faith in God.
Faith is not an action one performs during a designated period and then permanently completes in the way one completes a particular prayer. The underlying requirement therefore is not treated as the discharge of one timed prayer.
This is a legal-theoretical classification about the continuing character of the duty. It does not by itself settle the detailed capacity and responsibility of every individual. Its purpose is to distinguish the example from duties discharged by particular performances.