There's actually quite a bit said about sowing and reaping after the resurrection of Jesus. And I'm probably not going to list all of the relevant chapters, but here's a few:
Romans 6 says that it would be foolish to continue in sin because although grace will abound, you'll still reap consequences much too much of the time.
2Corinthians chapters 8 & 9 which is actually where prosperity preachers get quite a bit of their material.
Galatians 6 which could both be about good works and the support of a body of believers through offerings from the heart -- as well as those who sow law with grace will reap corruption and those who stay with the grace of God as receivers of it and dispensers of it to others without their having to deserve it, then you'll reap life.
Philippians 4 gets back on the subject of reaping from both prayers and offerings into fruitful ministry.
2Timothy 2 covers the subject of sowing and reaping from the vantage point of the growing spiritual Warrior for Christ who is becoming fit for Apostolic, Prophetic, Evangelistic, and Teaching ministry.
1Peter covers it from the turn the other cheek angle and receiving the intervention that converts your enemies and is the temporary destruction of those that don't renounce their wicked ways and embrace Jesus Christ as Lord.
1John chapter 2 covers it from the standpoint of talking about a multi-generational outlook on the growth of a body of believers from babes in Christ to the Elder at the gates that some are nervous to call fathers in the faith because of a misinterpretation of Christ's words about coveting undeserved titles that aren't delegated by God but are a product from wanting to be acknowledged by men without regards and reference point to what Father thinks about all of this.
I'm sure there's a way of interpreting the book of Revelation where you have the original seed, Jesus Christ, in the first chapter leading us through all of this mess until we're finally in the New Jerusalem of the book's closing pages. And you could perhaps interpret the growth in frequency and intensity of the judgments in the book of Revelation as a product of people's attitudes, actions, opinions, and mistreatments of Christ's body of believers in the earth.