Moses had initial warned the Jewish people about cutting themselves when mourning for the dead.
KJV Leviticus 19
28 Ye shall not make any cuttings in your flesh for the dead, nor print any marks upon you: I am the LORD.
But it seems during Jeremiah's time the Jewish people were actually practicing this ritual
KJV Jeremiah 16
5 For thus saith the LORD, Enter not into the house of mourning, neither go to lament nor bemoan them: for I have taken away my peace from this people, saith the LORD, even lovingkindness and mercies. 6 Both the great and the small shall die in this land: they shall not be buried, neither shall men lament for them, nor cut themselves, nor make themselves bald for them:
Did the Jewish people eventually practise this ritual as mentioned in the book of Jeremiah?