四部弟子(sì bù dì zǐ) “the four groups of Buddhist disciples,
i.e. monks, nuns, laymen, and laywomen”
Cf. 四輩(sì bèi) etc.; not found at HD. 3.587.; not found at DK. 3.38.;
66a23.應時，其地六反震動。國中人民各取天華復散佛上。四部弟子、諸天、世人愕然疑怪(p)
K. 20.5.bhikṣu-bhikṣuṇy-upāsakôpāsikā-; L. 4a14.比丘、比丘尼、優婆塞、優婆夷;