1 Corinthians 7:39; 1 Corinthians 9:14; 1 Corinthians 15:45

39 The wife is bound by the law as long as her husband liveth ; but if her husband be dead , she is at liberty to be married to whom she will ; only in the Lord.
14 Even so hath the Lord ordained that they which preach the gospel should live of the gospel.
45 And so it is written , The first man Adam was made a living soul; the last Adam was made a quickening spirit.