en_tn/mrk/08/15.md

Keep watch and be on guard

These two terms have a common meaning and are repeated here for emphasis. They can be combined. AT: "Keep watch" (See: rc://en/ta/man/translate/figs-doublet)

yeast of the Pharisees and the yeast of Herod

Here Jesus is speaking to his disciples in a metaphor they do not understand. Jesus is comparing the Pharisees' and Herod's teachings to yeast, but you should not explain this when you translate it because the disciples themselves did not understand it. (See: rc://en/ta/man/translate/figs-metaphor)