The priest's office (την ιερατειαν). LXX and Koine word from ιερευς, in N.T. only here and Luke 1:9.

To take tithes (αποδεκατοιν). Present active infinitive (in -οιν, not -ουν, as the best MSS. give it) of αποδεκατοω a LXX word (απο, δεκατοω), to take a tenth from (απο).

Brethren (αδελφους). Accusative case in apposition with λαον (people) unaffected by the explanatory phrase τουτ' εστιν (that is).

Though come out (καιπερ εξεληλυθοτας). Concessive participle (cf. Hebrews 5:8) with καιπερ (perfect active of εξερχομα).