A.T. Robertson Commentary Matthew 21:38

"But the husbandmen, when they saw the son, said among themselves, This is the heir; come, let us kill him, and take his inheritance." — Matthew 21:38 (ASV)

Take his inheritance (σχωμεν την κληρονομιαν αυτου). Ingressive aorist active subjunctive (hortatory, volitive) of εχω. Let us get his inheritance.