with the light - at early dawn, while still dark, when the traveler in the East usually sets out, and the poor laborer to his work; the murderous robber lies in wait then (Psa 10:8).
is as a thief - Thieves in the East steal while men sleep at night; robbers murder at early dawn. The same man who steals at night, when light dawns not only robs, but murders to escape detection.