The promise is the promise of the Spirit. The Gentiles are fellow heirs with those of Israel (Jews) who believe and this is the mystery of Christ revealed in the dispensation of grace that was given by revelation to the apostle Paul, which WAS NOT MADE KNOWN to the sons of men in other age (or dispensation) as it is now been revealed by the Spirit to his holy apostles and prophets. The mystery is the Jew and Gentile both having the promise of the Spirit through Christ.
here it is again...see if you can read it and still wrongly "divide the word of truth" into "dispensations.
New International Version
Surely you have heard about the administration of God's grace that was given to me for you,
New Living Translation
assuming, by the way, that you know God gave me the special responsibility of extending his grace to you Gentiles.
English Standard Version
assuming that you have heard of the stewardship of God’s grace that was given to me for you,
New American Standard Bible
if indeed you have heard of the stewardship of God's grace which was given to me for you;
King James Bible
If ye have heard of the dispensation of the grace of God which is given me to you-ward:
Holman Christian Standard Bible
you have heard, haven't you, about the administration of God's grace that He gave to me for you?
International Standard Version
Surely you have heard about the responsibility of administering God's grace that was given to me on your behalf,
NET Bible
if indeed you have heard of the stewardship of God's grace that was given to me for you,
Aramaic Bible in Plain English
If you have heard of the administration of the grace of God, which is given to me among you.
GOD'S WORD® Translation
Certainly, you have heard how God gave me the responsibility of bringing his kindness to you.
Jubilee Bible 2000
if ye have heard of the dispensation of the grace of God which has been given to me in you,
King James 2000 Bible
If you have heard of the dispensation of the grace of God which is given me toward you:
American King James Version
If you have heard of the dispensation of the grace of God which is given me to you-ward:
American Standard Version
if so be that ye have heard of the dispensation of that grace of God which was given me to you-ward;
Douay-Rheims Bible
If yet you have heard of the dispensation of the grace of God which is given me towards you:
Darby Bible Translation
(if indeed ye have heard of the administration of the grace of God which has been given to me towards you,
English Revised Version
if so be that ye have heard of the dispensation of that grace of God which was given me to you-ward;
Webster's Bible Translation
If ye have heard of the dispensation of the grace of God which is given me on your account.
Weymouth New Testament
if, that is, you have heard of the work which God has graciously entrusted to me for your benefit,
World English Bible
if it is so that you have heard of the administration of that grace of God which was given me toward you;
Young's Literal Translation
if, indeed, ye did hear of the dispensation of the grace of God that was given to me in regard to you,
......
paul was graciously given as a steward of the gospel of salvation to the gentiles; just the very same gospel the apostles to the jews gave the jews.
Certainly, you have heard how God gave me the responsibility of bringing his kindness to you.