en_tn/mrk/16/20.md

worked with them

worked together with them, helped them as they worked

confirmed the word

This idiom means they proved that their message was true. Alternate translation: "showed that his message, which they were speaking, was true" (See: rc://en/ta/man/jit/figs-idiom)

by the signs that went with them

"by enabling them wherever they went to do miracles that showed that they truly were his disciples"