Commentaries:
Robertson's Word Pictures (NT)
Who themselves also shall tell you the same things by word of mouth (kai autouv dia logou apaggellontav ta auta). Literally, "they themselves also by speech announcing the same things." The present participle, as here, sometimes is used like the future to express purpose as in Acts 3:26 eulogounta after apesteilen and so here apaggellontav after apestalkamen (Robertson, Grammar, p. 1128). Judas and Silas are specifically endorsed (perfect active indicative of apostellw) as bearers of the epistle who will also verbally confirm the contents of the letter.
Other Robertson's Word Pictures (NT) entries containing Acts 15:27:
Acts 15:32
Acts 16:4
1 Corinthians 6:13
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