The New Testament has much to say about “firstfruits”…
Christ is the “firstfruit” in being the first to rise from the dead and die no more… thus, paving the way for believers to have eternal life:
As Paul writes in I Corinthians 15: 20-21…
But Christ has indeed been raised from the dead, the firstfruits of those who have fallen asleep. For since death came through a man, the resurrection of the dead comes also through a man.
James reminds his readers that we are the crowning glory of creation:
God chose to give us birth through the word of truth that we might be a kind of firstfruits of all he created.
And we have been chosen by God, as the Holy Spirit sanctifies us when we believe the truth about salvation through Christ:
As Paul writes to the church in 2 Thessalonians 2 v 13…
God chose you as firstfruits to be saved through the sanctifying work of the Spirit and through belief in the truth.