The singers
shiyr (sheer)
to sing -- sing(-er, -ing man, -ing woman).
the children
ben (bane)
a son (as a builder of the family name), in the widest sense (of literal and figurative relationship, including grandson, subject, nation, quality or condition, etc.
of Asaph
Acaph (aw-sawf')
collector; Asaph, the name of three Israelites, and of the family of the first -- Asaph.
an hundred
me'ah (may-aw')
a primitive numeral; a hundred; also as a multiplicative and a fraction -- hundred(-fold), -th), + sixscore.
forty
'arba`iym (ar-baw-eem')
forty -- forty.
and eight
shmoneh (shem-o-neh')
a cardinal number, eight (as if a surplus above the perfect seven); also (as ordinal) eighth -- eight(-een, -eenth), eighth.
