I have heard you; that is, I will do for you according as you desire. And I will be faithful in giving you an account of what God shall reveal to me to be his will on your behalf. They called God Jeremiah's God, here Jeremiah calls him their God, both to mind them of God's relation to them, and their duty towards him.
Related Commentaries of Jeremiah 42:4
Jeremiah 42:4
4 Then Jeremiah the prophet said unto them, I have heard you; behold, I will pray unto the LORD your God according to your words; and it shall come to pass, that whatsoever thing the LORD shall answer you, I will declare it unto you; I will keep nothing back from you.