佛說觀佛三昧海經 3.66

3.66

時佛即放眉間大人相光，照諸人心心意開解，同時即得須陀洹道。諸優婆塞既得道已，見佛色身，端嚴微妙世間無比，求佛出家成阿羅漢。

Then the Buddha emitted light from the mahāpuruṣa mark between his eyebrows, illuminating the minds of those people so that their minds were opened and understood, and simultaneously they attained the path of the srotāpanna. Having attained the path, the upāsakas saw the Buddha's rūpakāya, dignified and wondrous beyond compare in the world, and they requested the Buddha to go forth and attained arhatship.