This phrase represents wanting or trying to kill someone. AT: "wanting to kill you" (See: [[rc://en/ta/man/translate/figs-metaphor]])
# They say
"They say to me." The men are speaking to Jeremiah.
# you will die by our hand
Here the men refer to their "hand" to emphasize that they plan to kill him themselves. AT: "we ourselves will kill you" (See: [[rc://en/ta/man/translate/figs-synecdoche]])