Charles Ellicott Commentary Jeremiah 27:4

"and give them a charge unto their masters, saying, Thus saith Jehovah of hosts, the God of Israel, Thus shall ye say unto your masters:" — Jeremiah 27:4 (ASV)

Thus says the Lord of hosts, the God of Israel. —As addressed to the outlying pagan nations, who were not his worshippers, the proclamation of the message, as coming from Jehovah Sabaoth, the God of Israel, had a special force, which we hardly appreciate as we read the English. They, with their hosts of earth, were setting themselves against the Lord of the hosts of both heaven and earth.