The New John Gill Exposition of the Entire BibleLamentations 3:63
Behold their sitting down, and their rising up…
actions; the whole course of their lives; all which fell under the
divine omniscience, (Psalms 139:2) ; but that is not barely here meant; but
that he would take particular notice hereof, and punish for the same.
It may have respect both to their lying down at night, and rising in
the morning; and to their sitting down at meals, and rising from them;
at which times they were always meditating mischief against the people
of God, or speaking opprobriously of them; when they made sport of
them, as follows:
I [am] their music;
or "music maker" F26; as Samson was to the
Philistines; the matter of their mirth; the subject of their song; and
the object of their derision.
F26 (Mtnygnm) "musicus", Gataker.