Agniveshyagrihyasutra 2.6.2.3

2.6.2.3

atha haike bruvate śmaśānamāpo devagṛhaṃ goṣṭhaṃ yatra ca brāhmaṇāḥ naprakṣāḷya pādau tatra na praveṣṭavyam iti \

Now some say: "A cremation ground, water, a temple of the gods, a cow pen, and where Brahmins are—one must not enter there without washing one's feet."