‏ Colossians 4:16

 When this epistle hath been read among you ( οταν αναγνωσθη παρ' υμιν η επιστολη ). Indefinite temporal clause with  οταν ( οτε αν ) and the first aorist passive subjunctive of  αναγινωσκω. The epistle was read in public to the church (Re 1:3).

 Cause that ( ποιησατε ινα ). Same idiom in Joh 11:37; Re 13:15. Old Greek preferred  οπως for this idiom. See 1Th 5:27 for injunction for public reading of the Epistle.

 That ye also read ( κα υμεις αναγνωτε ). Second aorist active subjunctive of  αναγινωσκω, to read.

 And the epistle from Laodicea ( κα την εκ Λαοδικιας ). The most likely meaning is that the so-called Epistle to the Ephesians was a circular letter to various churches in the province of Asia, one copy going to Laodicea and to be passed on to Colossae as the Colossian letter was to be sent on to Laodicea. This was done usually by copying and keeping the original. See Eph 1:1 for further discussion of this matter.

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