A.T. Robertson Commentary Acts 1:20

"For it is written in the book of Psalms, Let his habitation be made desolate, And let no man dwell therein: and, His office let another take." — Acts 1:20 (ASV)

For it is written (γεγραπτα γαρ). Luke here returns to the address of Peter interrupted by verses 18,19. Perfect passive indicative, the usual idiom in quoting scripture, stands written. Psalms 69 is often quoted as Messianic in Matthew and John.

His habitation (η επαυλις αυτου). Only here in the N.T., a country house, cottage, cabin.

His office (την επισκοπην αυτου). Our word bishopric (Authorized Version) is from this word, office of bishop (επισχοπος). Only that is not the idea here, but over-seership (επι, σκοπεω) or office as in 1 Peter 2:12. It means to visit and to inspect, to look over. The ecclesiastical sense comes later (1 Timothy 3:1).