ISB ~ Mark 8 v15

the leaven:A metaphor based on the “one loaf” in the boat (8:14). Jesus warns the disciples that as leaven permeates and expands bread, so the Pharisees and their teaching exert a corruptive influence on the crowds (Mt 16:11-12). Similar imagery is used elsewhere in the NT (Lk 12:1; 1 Cor 5:6-8; Gal 5:9).

Herod:Herod Antipas, tetrarch of Galilee. He was interested in Jesus primarily as a miracle worker (Lk 23:8). See note on 6:14.