Acts 1:20

“For it is written in the book of Psalms, etc.] In (<196925>Psalm 69:25). These are the words of Peter, citing the Scripture he had said must be fulfilled, which the Holy Ghost, by David, had spoke concerning Judas: let his habitation be desolate. The Arabic and Ethiopic versions render it, “his city”; meaning, perhaps, the city of Jerusalem; and which afterwards did become desolate, and was utterly destroyed: and let no man dwell therein; in his habitation. The psalm, out of which these words are cited, is a psalm concerning the Messiah, and there are many passages cited out of it in the New Testament, and applied to him, or referred unto; (see <430217>John 2:17 15:25 19:28 <451503>Romans…”

“his bishopric--or "charge." The words are a combination of Psa 69:25 and Psa 109:8; in which the apostle discerns a greater than David, and a worse than Ahithophel and his fellow conspirators against David.”

“For it is written ... - See Psalms 69:25. This is the prediction doubtless to which Peter refers in Acts 1:16. The intermediate passage in Acts 1:18-19, is probably a parenthesis; the words of Luke, not of Peter. So Calvin, Kuinoel, Olshausen, DeWette, and Hackett understand it. It is not probable that Peter would introduce a narrative like this, with which they were all familiar, in an address to the disciples. The Hebrew in the Psalm is, “Let their habitation (Hebrew: fold, enclosure for cattle; tower, or palace) be desolate, and let none dwell in their tents.” This quotation is not made literally from the Hebrew, nor from the Septuagint. The plural is changed to the singular, and there…”

“His bishopric - That is, his apostleship. Psa 69:25. Acts 1:21”

“1:20-21 ‘Let someone else take his position’: It was imperative that a replacement be found for Judas so that his position as the twelfth apostle would not remain empty. The new people of God, like Israel, were to have twelve designated and appointed leaders (see Matt 19:28; Luke 22:29-30).”

“in: Act 13:33; Luk 20:42, Luk 24:44 Let his: Psa 69:25, Psa 109:9-15; Zac 5:3, Zac 5:4 his: Act 1:25; Psa 109:8 bishopric: or, office, or charge Acts 1:21”