Have a doubt with this reference from Elements of Hindu Iconography - 2nd volume.
"At the time of the Mahabharata, animals seem to have been offered systematically as sacrifices in the temple of Siva, for, we hear Krishna admonishing Jarasandha for his cruelty to other kings : says he, " what pleasure can those princes have in existence, when they have been consecrated for slaughter and kept as victims in the temple of Pasupati....Thou king, has set apart for sacrifice to Mahadeva Kshatriya princes In so far as you have resolved to offer these kings to Rudra, the guilt committed by you by slaughtering them will also attach to us and we have never seen such a thing as offering human beings in sacrifice and thou seek to sacrifice to Sahkara human victims." http://www.poetryinstone.in “*Here the language of stone surpasses the language of man*” – Nobel laureate, Rabindranath Tagore