the Sabeans

This refers to a people in a region in modern day Yemen. Here it represents a group of raiders or bandits. (See: rc://en/ta/man/jit/translate-names and rc://en/ta/man/jit/figs-metonymy)

fell on them

Here "fell" represents the idea of attacking. Alternate translation: "attacked them" (See: rc://en/ta/man/jit/figs-metaphor)

Here striking represents killing. (See: rc://en/ta/man/jit/figs-metonymy)

Here "edge" represents the part of swords that kill people, that is, either the point or the sharp edge. Also, all the swords of the Sabeans are spoken of as if they were only one sword. (See: rc://en/ta/man/jit/figs-metaphor and rc://en/ta/man/jit/figs-genericnoun)

"I am the only one who has escaped and can report it to you"

or "tell"