Mat 21:37 But last of all he sent unto them his son, saying, They will reverence my son.
Mat 21:38 But when the husbandmen saw the son, they said among themselves, This is the heir; come, let us kill him, and let us seize on his inheritance.
Mat 21:39 And they caught him, and cast [him] out of the vineyard, and slew [him].

Again, Christ uses the repeated pattern of physical, mental, and emotional three times to create a cycle within each cycle. If this pattern was an accident in the previous passages, can its repetition here be a coincidence as well?

The vineyard owner is represents the physical (as a symbol of God the Father as creator of the universe). His physical, mental, and emotional cycle is the action ("sent"), the thought ("saying") and the expected relationship ("reverence my son").

The decision-making of the "husbandmen," that is, the sharecroppers, is the mental part of the cycle. This decision-making starts with the physical symbolized as it usually is by sight ("saw the son"), them moves to the mental symbolize as usually by talking ("said among themselves"), and finally moving to a decision about relationship ("kill him and seize his inheritance").

The cycle is repeated a third time, defining the relationship. Again, there are three steps, but this time they are in a little different sequence. The pattern here is physical ("caught"), emotional, ("cast [him] out of the vineyard"), and mental ("slew him").

"Reverence" is from entrepô, which means "to turn [something] about," "to make one turn," and, as a metaphor, for "putting one to shame." In its passive form (entrapêsomai, not used here) it means "to turn [yourself] about," "to feel misgivings," "to hesitate," "to give heed," "to respect," and "to reverence."

"Heir" is from klêronomos, which means "heir" and "heir apparent."
"Inheritance" is from klêronomia, which means "inheritance," "property," and "possession."

"Caught" is from "lambanô, which means "to take," "to seize," "to catch," "to apprehend with the senses," "to receive," "to accept," and "to conceive." It is most commonly translated as "receive" in the Gospels.