8. ἔλεγεν γάρ. Here the force of the imperf., as referring to action which preceded something already mentioned, is best represented in English by the pluperf.; For He had been saying, or had said; cf. Mar 5:28, Mar 6:18; Mat 14:4; also Act 9:39, ὅσα ἐποίει, “which Dorcas had been making while she was with them.” Burton, § 29.
τὸ πνεῦμα τὸ ἀκάθαρτον. Nom. with art. for voc., as often in N.T. (Mar 5:41, Mar 9:25; Luk 8:54; Luk 10:21; Luk 18:11; Luk 18:13; Col 3:18; Eph 6:1; etc.). It is specially common with imperatives and may be due in some cases to Heb. influence (2Ki 9:31; Jer 47:6).