With Ambaṭṭha 2.4.15

2.4.15

api nu tvaṃ imañceva anuttaraṃ vijjācaraṇasampadaṃ anabhisambhuṇamāno pavattaphalabhojanatañca anabhisambhuṇamāno kandamūlaphalabhojanatañca anabhisambhuṇamāno gāmasāmantaṃ vā nigamasāmantaṃ vā agyāgāraṃ karitvā aggiṃ paricaranto acchasi sācariyako”ti?

Have you with your denomination … set up a fire chamber in the neighborhood of a village or town and dwelt there serving the sacred flame?”