Part 1, 7. Chorus. "And he shall purify"

Whose song is Part 1, 7. Chorus. "And he shall purify"?

Artist Album
Neville Marriner - Academy & Chorus of St.Martin-in-the-Fields
Handel: Messiah, 1743 London version [Disc 1]
Sir Neville Marriner; Academy & Chorus of St.Martin-in-the-...
Handel - Messiah