Some Jews decide to die (Macc 1:62-1:64)

“However, many in Israel stood firm. They were resolved in their hearts not to eat unclean food. They chose to die rather than to be defiled by food or to profane the holy covenant. They did die. Very great wrath came upon Israel.”

Here we have an instance of Jewish martyrs. They were willing to die rather than to eat unclean food. They refused to abuse the holy Mosaic covenant. For that they were killed.