Verse 1
Hebrews ch. 11 is a picture gallery of OT heros
Romans ch. 16 is a picture gallery of NT believers
Romans 16:1,2 Paul commends Phebe to the Christians at Rome,
Romans 16:3-16 and sends salutations to many by name.
Romans 16:17-20 He warns them to take heed of those who cause
divisions and offences.
Romans 16:21-24 After sundry salutations,
Romans 16:25-27 he concludes with praise to God.
How could Paul know so many people at Rome? He had never been there. One-third of the names are women in the Roman church, this is interesting considering woman’s role in Judaism.
Phebe -- The poets called the moon Phoebe, as they did the sun Phoebus. This name is likely to have been given by her parents. Phoibe (which means"bright, radiant") was the name of a pagan goddess. (Apollos, a devote Jew, also had a mythological name.)
Phebe is in all likelihood the one who carried Paul’s letter to Rome. Paul might have been writing this letter to the Romans from Corinth on a winter-long stop there near the end of his third missionary journey (see Acts 20:2-3).
our sister -- i.e. in Christ, and by the profession of the same faith: see James 2:15.
servant -- Deaconess (feminine) - The word is used in both a technical and non-technical sense. It is an often used word to indicate service. The qualification of 1Timothy 3 is of deacons’ wives, not deaconesses.
Paul uses the Greek word (διάκονος, diakonos), a word which is masculine in form but was used for both men and women. Its basic connotation is “servant, helper, one who carries out the will or purpose of another, one who ministers to the needs of others.” The NT usually uses it in this generic sense for Christian workers (and others). In this case the English word “servant” is most appropriate. - CPNIV
servant of the church -- It is not meant she was a deaconness, or one of the college of widows, of whom he speaketh, 1 Timothy 5:9. But she served the church, in harbouring and succouring the saints that were driven out of their country; yea, as appears by the next verse, she was a succourer of the ministers of the gospel, and of the apostle himself. We read, Luke 8:3, of some that ministered unto the Lord of their substance; there the same word is used. And this Phebe seems to have been employed in the same works; she ministered unto Paul as Onesiphorus did, 2 Timothy 1:18; there the same word is used again. - BN
church -- This is the first use of the word “church” (ἐκκλησία, ekklesia) in Romans, and (as it does most of the time in Paul’s writings) it refers to the local congregation, the collective body of Christians in a particular area. - CPNIV
Cenchrea -- A port or haven belonging to Corinth, on the east side (about 7 miles) towards Asia: there was another on the west side towards Italy, called Lechea. By reason of this double haven, Corinth was called by the poets, Bi maris. Here Paul paid a vow, which he had made, Acts 18:18.
Apparently there was a distinct church at Cenchrea as well as at Corinth itself. Such church is no where else mentioned. Acts 18:18; Romans 16:1. Such church could have been included in Paul’s reference to Achaia, Romans 15:26;
(Acts 18:12; Acts 18:27; Acts 19:21; Romans 15:26; Romans 16:5; 1 Corinthians 16:15; 2 Corinthians 1:1; 2 Corinthians 9:2; 2 Corinthians 11:10; 1 Thessalonians 1:7; 1 Thessalonians 1:8.)
From the introduction in 2 Corinthians 1:1 it seems the letter would have included such church at Cenchrea if it was distinct from Corinth.