Be subject therefore unto God (hupotagēte oun tōi theōi). Second aorist (ingressive) passive imperative of hupotassō, old verb, to range under (military term also). Same form in 1Pe 2:23; 1Pe 5:5. With the dative case theōi (unto God). The aorist has the note of urgency in the imperative. Note the ten aorist imperatives in Jam 4:7-10 (hupotagēte, antistēte, eggisate, katharisate, hagnisate, talaipōrēsate, penthēsate, klausate, metatrapētō, tapeinōthēte).
But resist the devil (antistēte de tōi diabolōi). Second aorist (ingressive) active (intransitive) imperative of anthistēmi, “take a stand against.” Dative case diabolōi. Result of such a stand is that the devil will flee (pheuxetai, future middle of pheugō). See 1Pe 5:8.; Eph 6:11.; Luk 10:17.