Bible Verses About Seed: Preaching the gospel

Then he spake many things to them in parables, saying, Behold, a sower went forth to sowe.

Which in deede is the least of all seedes: but when it is growen, it is the greatest among herbes, and it is a tree, so that the birdes of heauen come and builde in the branches thereof.

If wee haue sowen vnto you spirituall thinges, is it a great thing if we reape your carnall thinges?