Albert Barnes Commentary Matthew 21:34

"And when the season of the fruits drew near, he sent his servants to the husbandmen, to receive his fruits." — Matthew 21:34 (ASV)

And when the time of the fruit drew near, etc. The time of gathering the fruit. The vineyard was let out, probably for a part of the fruit, and the owner sent to receive the part that was his.

Sent his servants. These doubtless represent the prophets sent to the Jewish people.