Romans 16:5

5.Who is the first-fruit, etc. This is an allusion to the rites of the law; for as men are sanctified to God by faith, they who first offer themselves are fitly called the first-fruit. Whosoever then is called first in time to the faith, Paul allows him the prerogative of honor: yet he retains this eminence only when the end corresponds with the beginning. And doubtless it is no common honor when God chooses some for first-fruits: and there is in addition a greater and an ampler trial of faith, through a longer space of time, provided they who have first begun are not wearied in their course. (474)