The ceremony which makes the recipient a 優婆塞 or 優婆夷 upasaka or upāsikā male or female disciple, accepting the five commandments. There are 五種三歸 five stages of sangui; the first two are as above, at the third the eight commandments are accepted, at the fourth the ten, at the fifth an the commandments. 三歸 is also a general term for a Buddhist.

A Dictionary of Chinese Buddhist Terms, William Edward Soothill and Lewis Hodous

在家的男女，初受三歸，次受五戒，便成為優婆塞或優婆夷。

陳義孝編, 竺摩法師鑑定, 《佛學常見辭彙》