en_tn/jer/34/12.md

the word of Yahweh came to

See how you translated this in Jeremiah 1:1.

each man must send away his brother, his fellow Hebrew who had sold himself to you and served you

AT: "each of you must free any fellow Hebrews who sold themselves to you and have have been your slaves"

Send him away in freedom

AT: "You must let them be free from serving you"

did not listen to me and or pay attention

Both these phrase are saying basically the same thing and are combined for emphasis. (See: rc://en/ta/man/translate/figs-parallelism)