him - Cyrus, type of Messiah, who redeems the captives of Satan “without money and without price” (Isa 55:1), “freely” (gratuitously) (Isa 52:3; Isa 61:1; Zec 9:11; Rom 3:24).
in righteousness - to fulfil My righteous purpose (see on Isa 41:2; see on Isa 42:6; see on Jer 23:6).