Who is the Lord of hosts in Jeremiah 31:35?

In Jeremiah 31:35, the Lord of hosts is the Creator Himself—the One who gives the sun for light by day, appoints the moon and stars for light by night, and divides the sea when its waves roar. He is the sustainer and keeper of everything, and His name is the Lord of hosts.

Les explains that Jeremiah 31:35 identifies the Lord of hosts as the Creator Himself, the One who gives the sun for light by day and the ordinances of the moon and stars for light by night, and who divides the sea when its waves roar. Les emphasizes that this is the Creator who is the sustainer and keeper of everything. The passage then says that if those ordinances depart from before Him, then the seed of Israel would cease from being a nation forever; but since they cannot depart, God will never cast off Israel.

Jeremiah 31:35

Thus saith the LORD, which giveth the sun for a light by day, and the ordinances of the moon and of the stars for a light by night, which divideth the sea when the waves thereof roar; The LORD of hosts is his name:

What do Jeremiah 31:35-36 teach about whether God will ever cast off Israel?

Jeremiah 31:35–36 teaches that God will never cast off Israel. He points to fixed ordinances—the sun, moon, stars, and sea—as sure as creation itself. If those natural laws could depart or heaven be measured and earth’s foundations searched out, only then would Israel cease as a nation. Since that cannot happen, God will not cast them off.