Mahānāmasutta

sn55.37:4.1 “But how is a faithful lay follower defined?”

sn55.37:4.2 “It’s when a lay follower has faith in the Realized One’s awakening:

sn55.37:4.3 ‘That Blessed One is perfected, a fully awakened Buddha, accomplished in knowledge and conduct, holy, knower of the world, supreme guide for those fit for training, teacher of gods and humans, awakened, blessed.’

sn55.37:4.4 Then they’re considered to be a faithful lay follower.”