Charles Ellicott Commentary Psalms 91:6

"For the pestilence that walketh in darkness, Nor for the destruction that wasteth at noonday." — Psalms 91:6 (ASV)

Darkness ... noonday. —Night and noon are, in Eastern climates, the most unwholesome, the former from exhalations, the latter from the fierce heat.

Destruction. —From a root meaning “to cut off;” here, from parallelism, “deadly sickness.”