Jeremiah 42:19

MLV⁽ⁱ⁾ ¹⁹ Jehovah has spoken concerning you*, O remnant of Judah, Go not into Egypt. Know certainly that I have testified to you* this day.

Online Parallel Study Bible

Go.God knew, that such was their miserable propensity to idolatry, that they would adopt the idolatrous worship of Egypt. Add to which, their going thither for protection was in effect refusing to submit to the king of Babylon, to whom God had decreed the rule of Judah and the neighbouring kingdoms.
Deuteronomy 17:16; Isaiah 30:1-7; Isaiah 31:1-3; Ezekiel 17:15
know.
Jeremiah 38:21; Ezekiel 3:21; Acts 20:26; Acts 20:27
admonished you. Heb. testified against you.
Deuteronomy 31:21; 2 Chronicles 24:19; Nehemiah 9:26; Nehemiah 9:29; Nehemiah 9:30; Acts 2:40; Ephesians 4:17; 1 Thessalonians 4:6