Srimad Bhagavadam 4.21.12
“One who thinks the Deity in the temple to be made of wood or stone, who thinks of the spiritual master in the disciplic succession as an ordinary man, who thinks the Vaiṣṇava in the Acyuta-gotra to belong to a certain caste or creed or who thinks of caraṇāmṛta or Ganges water as ordinary water is taken to be a resident of hell.” (Padma Purāṇa)
https://vedabase.io/en/library/sb/4/21/12/