We do acknowledge that First Fruits and Tithes are Old Testament ordinances under the Mosaic Law, however, the scripture seems to imply they can be use as a gauge in the New Testament Church to whosoever will.
They are not mandated as a whole but one could tap into another dimension of God's blessing (if) they are practice in faith believing.
Three main ways of giving to God are found in the scripture.
1. First Fruits
The true heart beat of them all had nothing to do with money or other resources within themselves.
It is in the manner / honor in which they were presented to the Lord.
With this in mind we explore:
1. Prov. 3:5-11 First Fruits
2. Malachi 3:8-10 Tithes
3. Luke 6;38 Offerings
Most importantly we discover they all MUST be coupled with HONOR in order to be acceptable unto the Lord.
Offerings to God without honor will never be accepted by God.
We must understand this because it is possible that the church can accept the offerings but
it doesn't guarantee God will.
Is there such a thing as giving in vain?
The scripture teach clearly that this can easily be the case if we are not careful!