2 Corinthians 2:12

Now when I arrived at Troas to preach the good news of Christ, even though a door [of opportunity] opened for me in the Lord,

Acts 14:27

Arriving there, they gathered the church together and began to report [in great detail] everything that God had done with them and how He had opened to the Gentiles a door of faith [in Jesus as the Messiah and Savior].

Acts 16:8

so passing by Mysia, they went down to Troas.

Acts 20:1-6

After the uproar had ended, Paul sent for the disciples, and when he had encouraged them he told them goodbye, and set off to go to Macedonia.

Acts 20:8

Now there were many lamps in the upper room where we were assembled,

Romans 1:1

Paul, a bond-servant of Christ Jesus, called as an apostle (special messenger, personally chosen representative), set apart for [preaching] the gospel of God [the good news of salvation],

1 Corinthians 16:9

because a wide door for effective service has opened to me [in Ephesus, a very promising opportunity], and there are many adversaries.

Colossians 4:3

At the same time pray for us, too, that God will open a door [of opportunity] to us for the word, to proclaim the mystery of Christ, for which I have been imprisoned;

Revelation 3:7-8

“And to the angel (divine messenger) of the church in Philadelphia write:

“These are the words of the Holy One, the True One, He who has the key [to the house] of David, He who opens and no one will [be able to] shut, and He who shuts and no one opens:

Treasury of Scripture Knowledge

Summary

Furthermore, when I came to Troas to preach Christ's gospel, and a door was opened unto me of the Lord,

Bible References

When

Acts 16:8
so passing by Mysia, they went down to Troas.
Acts 20:1
After the uproar had ended, Paul sent for the disciples, and when he had encouraged them he told them goodbye, and set off to go to Macedonia.

And a

Acts 14:27
Arriving there, they gathered the church together and began to report [in great detail] everything that God had done with them and how He had opened to the Gentiles a door of faith [in Jesus as the Messiah and Savior].
1 Corinthians 16:9
because a wide door for effective service has opened to me [in Ephesus, a very promising opportunity], and there are many adversaries.
Colossians 4:3
At the same time pray for us, too, that God will open a door [of opportunity] to us for the word, to proclaim the mystery of Christ, for which I have been imprisoned;
Revelation 3:7
“And to the angel (divine messenger) of the church in Philadelphia write:

“These are the words of the Holy One, the True One, He who has the key [to the house] of David, He who opens and no one will [be able to] shut, and He who shuts and no one opens: