CC Ādi 14.75

ihā śuni’ mātāke kahila brahma-jñāna
vismitā ha-iyā mātā karāila snāna
Word for word: 
ihā śuni’ — hearing this; mātāke — unto His mother; kahila — explained; brahma-jñāna — absolute knowledge; vismitā — amazed; ha-iyā — becoming; mātā — the mother; karāila — forced; snāna — bathing.
Translation: 
Hearing this, Lord Caitanya Mahāprabhu taught His mother about absolute knowledge. Although amazed by this, His mother forced Him to take a bath.
Purport: 

The absolute knowledge explained by the Lord to His mother is described by Śrīla Bhaktivinoda Ṭhākura in his Amṛta-pravāha-bhāṣya as follows: “The Lord said, ‘Mother, that this is pure and that is impure is surely a worldly sentiment with no basis in fact. You have cooked food for Lord Viṣṇu within these pots and offered the food to Him. How then can these pots be untouchable? Everything in relationship with Viṣṇu is to be considered an expansion of Viṣṇu’s energy. Viṣṇu, the Supersoul, is eternal and uncontaminated. How then may these pots be considered pure or impure?’ Hearing this discourse on absolute knowledge, His mother was very much astonished and forced Him to take a bath.”