“For he that is called in the Lord, being a servant, is the Lord's freeman: likewise also he that is called, being free, is Christ's servant.”
King James Version (KJV)
7:22 Is the Lord's freeman - Is free in this respect. The Greek word implies one that was a slave, but now is free. Is the bondman of Christ - Not free in this respect; not at liberty to do his own will.
1Co 7:22 For he that is called in the Lord [being] a servant, etc. The eternal equality of the servant and freeman in Christ is shown. The "servant" is Christ's freedman, since Christ has freed him from sin; the freeman, when converted, is Christ's servant.