Charles Ellicott Commentary Jeremiah 30:10

"Therefore fear thou not, O Jacob my servant, saith Jehovah; neither be dismayed, O Israel: for, lo, I will save thee from afar, and thy seed from the land of their captivity; and Jacob shall return, and shall be quiet and at ease, and none shall make him afraid." — Jeremiah 30:10 (ASV)

Therefore fear not. —The higher strain of language into which the prophecy has risen here is indicated by the parallelism of the two clauses in each member of the sentence. The whole verse is poetic in its form. The words have in them something of the ring of Isaiah 41:10.