The four groups of Buddhist disciples. See 四輩.

catuṣ-pariṣad*.

佛教漢梵大辭典, 平川彰 Buddhist Chinese-Sanskrit Dictionary, Akira Hirakawa

p 623

四部衆 (sì bù zhòng) 　( “the fourfold assemblies of Buddhist disciples, i.e. monks, nuns, laymen, and laywomen” ) Cf. 四輩(sì bèi) etc. ;

{《漢語大詞典》3.587a(梁書)} ; {《大漢和辞典》3.38d(法華經)} ;

Dharmarakṣa: {63b24} 爾時世尊與四部衆眷屬圍繞，而爲説經(p)

{K.5.7} catur~ parṣad~

{O} pariṣad~

Kumārajīva: {L.2b7} 四衆

Dharmarakṣa: {65b25}

{K.15.11} do.

Kumārajīva: {L.3c4} do.

Dharmarakṣa: {100b15} 寧察斯四部衆？(p)

{K.224.2} parṣad~

Kumārajīva: {L.30c1} 大衆

Dharmarakṣa: {101c24} 然後爾乃爲四部衆宣傳此經(p)

{K.234.6} catur~ parṣad~

Kumārajīva: {L.31c24} 四衆

Dharmarakṣa: {102c5}

{K.240.5} do.

Kumārajīva: {L.32c2} do.

Dharmarakṣa: {103a23}

{K.242.7} do.

Kumārajīva: {L.32c24} do.

Dharmarakṣa: {104a8}

{K.249.10} do.

Kumārajīva: {L.33c2} do.

Dharmarakṣa: {110a23}

{K.294.11} parṣā~ catur~

Kumārajīva: {L.39c3} do.

Dharmarakṣa: {110c21}

{K.300.10} catur~ parṣad~

Kumārajīva: {L.40a21} do.

Dharmarakṣa: {124a27}

{K.389.4} do.

Kumārajīva: {L.52a1} 諸四衆

Dharmarakṣa: {131b13}

{K.461.4-}

Kumārajīva: {not found at L.60a14}

etc. 

A Digital Edition of A Glossary of Dharmarakṣa translation of the Lotus Sutra by Seishi Karashima, 1998