Leap for joy (skirtēsate). Old verb and in lxx, but only in Luke in the N.T. (here and Luk 1:41, Luk 1:44). It answers to Matthew’s (Mat 5:12) “be exceeding glad.”
Did (epoioun). Imperfect active, the habit of “their fathers” (peculiar to both here). Mat 5:12 has “persecuted.” Thus they will receive a prophet’s reward (Mat 10:41).