As he sowed (εν τω σπειρειν αυτον). Literally, "in the sowing as to him," a neat Greek idiom unlike our English temporal conjunction. Locative case with the articular present infinitive.

By the wayside (παρα την οδον). People will make paths along the edge of a ploughed field or even across it where the seed lies upon the beaten track.

Devoured (κατεφαγεν). "Ate down." We say, "ate up." Second aorist active indicative of κατεσθιω (defective verb).