Musannaf Ibn Abi Shayba 1:617

Hushaym narrated to us, he said: Yahya ibn Sa’id informed us, from the one who narrated to him, from ‘A’ishah, that she was asked about a man who passes by a filthy place while he is in a state of purity. She said: "He may pass by a clean place, so it purifies some of it [by means of] some of it."