Gospel partnership means networking with other followers of Jesus to personally tell, pray, and give toward sharing the good news of Jesus.
In writing to the church at Philippi, in Philippians 1:1-11 Paul thanked God for their fellowship “in [eis] the Gospel,”. He meant that they were contributing to the spread of the gospel in tangible ways, i.e., primarily through their support.
The gospel was not only the environment of their fellowship but also its goal. Had it not been for the gospel, they would not have met. Paul generally stated that the tie that bound Christians together was the gospel message. Here, however, the construction suggests that the advancement of the gospel united them. In their support of Paul, they contributed to the work of God in the world through the gospel. When the Philippians were converted, they were given a privilege of promoting the gospel.Richard R. Melick, Philippians, Colossians, Philemon, vol. 32, The New American Commentary (Nashville: Broadman & Holman Publishers, 1991), 56–57.