New Defender's Study Bible Notes
20:3 Magor-missabib. This symbolic name of Pashur given by the Lord through Jeremiah means something like “Fear-Surrounding-Him.”
20:4 captive into Babylon. There have been frequent indirect references to the imminent Babylonian exile in previous chapters, but this is the first actual mention of the name, out of some 160 in the book of Jeremiah altogether.
20:9 burning fire. The Word of God simply cannot be quenched for one who truly loves God and understands what God’s Word has done for him and what it means for the world. Even though that man is the object of reproach and derision because of it (Jeremiah 20:8), he must proclaim it to others in whatever way he can.
20:10 familiars. This Hebrew word (shalom) is usually treated “peace.” Apparently the reference here is to the false prophets and apostate priests (like Pashur) who were repeating “Peace, peace; when there is no peace” (Jeremiah 8:11).