For the Scripture says, "You shall not muzzle the ox when it treads out the grain." And, "The laborer is worthy of his wages."
Thus Paul here quoted from the Christian gospels, extending to them the full authority and status of Scripture.  As 1Timothy was written during that period shortly before Paul's second imprisonment, the bearing of this on the date of Luke's gospel, which he here quoted, should not be overlooked.  Here is an insurmountable denial of the late dating of Luke. "The conclusion is inevitable that the writer of this epistle was acquainted with and quoted from the gospel of Luke."[22]