The New John Gill Exposition of the Entire BibleJeremiah 6:26
O daughter of my people, gird thee with sackcloth…
as a token of repentance for sin; so the king of Nineveh and his
subjects did, to show their repentance, (Jonah 3:6,8) or as a sign of
mourning, for the calamities coming on them, (Genesis 37:34)
and wallow thyself in ashes;
or roll thyself in them, as a token of the
same. The Targum is,
``cover your heads with ashes.''
Make thee mourning as for an only son;
which of all is the most bitter:
and therefore it is added,
most bitter lamentation;
see (Zechariah 12:10) .
For the spoiler shall suddenly come upon us;
that would spoil their cities, towns, villages, and houses, and them of
all their wealth and substance, and carry it away.