A.T. Robertson Commentary Mark 12:7

"But those husbandmen said among themselves, This is the heir; come, let us kill him, and the inheritance shall be ours." — Mark 12:7 (ASV)

Among themselves (προς εαυτους). This phrase alone in Mark. Luke 20:14 has "with one another" (προς αλληλους), reciprocal instead of reflexive, pronoun.