“We went
out
with the Messenger of Allah (ﷺ) to attend a funeral, and he saw
some people who had cast aside their upper sheets and were walking in
their shirts only. The Messenger of Allah (ﷺ) said: ‘Are you
adopting the practice of the days of ignorance?’ or; ‘Are you
imitating the behavior of the days of ignorance? I was about to
supplicate against you that you would return in a different form.’
So
they put their sheets back on and never did that again.”
Sunan Ibn Majah Book 6, Hadith 53