Jeremiah 32:12

32:12 I took both copies of the deed of purchase and gave them to Baruch son of Neriah, the son of Mahseiah. I gave them to him in the presence of my cousin Hanamel, the witnesses who had signed the deed of purchase, and all the Judeans who were housed in the courtyard of the guardhouse.

Jeremiah 36:4

36:4 So Jeremiah summoned Baruch son of Neriah. Then Jeremiah dictated to Baruch everything the Lord had told him to say and Baruch wrote it all down in a scroll.

Jeremiah 45:1

Baruch is Rebuked but also Comforted

45:1 The prophet Jeremiah spoke to Baruch son of Neriah while he was writing down in a scroll the words that Jeremiah spoke to him. This happened in the fourth year that Jehoiakim son of Josiah was ruling over Judah.