Religions call for various forms of purification, whether through a visit to the Ganges, the ablutions required for Muslim prayer, or the ritual of baptism. Here is an ecstatic comment on the subject by the Punjabi mystic Bullhe Shah (1680-1757 CE). For more about Bullhe (also Bulleh or Bullha) Shah, see this earlier post.
If the divine is found through ablutions
surely frogs and fish would find him first
if the divine is hidden in jungles
the cattle would have discovered him by now
O Bulleh, the divine is found by those
with pure and true heart
Translation Fuad Usman Khan