Like Having Eaten Something Disgusting
Imām Ibn Taimiyyah, may Allāh have mercy on him, said:
The laws [of Allāh] are nourishment for hearts, so when hearts have fed upon or drunk from invented religious matters, there’s no space left in them for that which has been legislated [of true Islam], so they’re like someone who’s eaten or drunk rotten, disgusting things.
Iqtiḍāʾ Al-Ṣirāṭ Al-Mustaqīm, vol. 2, p. 104.