The Servant is worthy of his hire. Where is it found in Scripture?

Matthew 10:10 - nor bag for your journey, nor two tunics, nor sandals, nor staffs; for a worker is worthy of his food.

Luke 10:7 - And remain in the same house, eating and drinking such things as they give, for the laborer is worthy of his wages. Do not go from house to house.

1 Timothy 5:18 - For the Scripture says, "You shall not muzzle an ox while it treads out the grain," and, "The laborer is worthy of his wages."

[Quotes from NKJV]