Jeremiah 16:21

Overview - Jeremiah 16
The prophet, under the types of abstaining from marriage, from houses of mourning and feasting, foreshews the utter ruin of the Jews;
10 because they were worse than their fathers.
14 Their return from captivity shall be stranger than their deliverance out of Egypt.
16 God will doubly recompense their idolatry.
Treasury of Scripture Knowledge

Jeremiah 16:21  (King James Version)
Therefore, behold, I will this once cause them to know, I will cause them to know mine hand and my might; and they shall know that my name is The LORD.

I will this
Exodus 9:14-18 ; 14:4 Psalms 9:16 ; Ezekiel 6:7 ; Ezekiel 24:24 Ezekiel 24:27 25:14

and they
33:2 Exodus 15:3 ; Psalms 83:18 ; Isaiah 43:3 ; Amos 5:8

The Lord