1 Corinthians 1:6

Even as the testimony of Christ was confirmed in you: so that ye come behind in no gift; waiting for the revelation of our Lord Jesus Christ.

Testimony of Christ was confirmed in you ... is Paul's way of declaring that the Corinthians had believed and obeyed the gospel of Christ as it had been preached to them. This was the source of all the riches of grace which they had received through their being united with Christ and "in him."

Ye come behind in no gift ... The reference here is to the entire galaxy of gifts, in the general sense, which attended establishment of churches of Christ under the apostolic preaching. As Grosheide said:

In early Christian times people must have seen all the gifts of the Holy Spirit, the special as well as the permanent, as a unity. They were not differentiated, neither had the church as yet experienced that the special gifts were not going to remain.[6]

Waiting for the revelation of our Lord Jesus Christ ... This is a reference to the Second Advent of Christ, indicating that the final redemption of people will take place then, and that the time of probation is essentially a period of waiting and expecting. There is no hint here that Paul or the Corinthians believed that the last Advent would come immediately, or in their lifetime.