Mujahidin Zulkiffli said the action of posting pictures of the animals smacked of ostentatious behaviour and had no basis in Islam.
“Is this Islamic?” he asked in a Facebook post accompanied by a picture of more than a dozen severed heads of cows arranged on the ground, as some 20 people stood behind smiling.
It is not known where or when the picture was taken.
Mujahidin said the ritual slaughter of animals should be done in moderation.
“And there’s absolutely no need to show off like this. Showing off, in Islam, is called riak. And riak destroys all the pahala gained in performing a deed,” he added.
Pahala refers to the Malay word for “reward”.
Muslims mark Aidiladha by slaughtering animals and distributing the meat to the poor.
Mujahidin said making a scene out of the slaughtered beasts amounted to killing animals “for nothing but some fame amongst your friends and some hatred among animal lovers”.
“Doing it for food is excusable but overdoing a ritual is cruelty,” he added.