en_tn_condensed/jdg/13/19.md

with the grain offering

This law requires a grain offering to be offered when a burnt offering is made. Alternate translation: "with the grain offering required with it" or "with the grain offering to accompany it" (See: rc://en/ta/man/jit/figs-explicit)

on the rock

"on the altar." The altar Manoah sacrificed the offering on was a rock.

He did something

"The angel did something"