Mark 12:21 Meaning

19Master, Moses wrote unto us, If a man's brother die, and leave his wife behind him, and leave no children, that his brother should take his wife, and raise up seed unto his brother.

20Now there were seven brethren: and the first took a wife, and dying left no seed.

21And the second took her, and died, neither left he any seed: and the third likewise.

22And the seven had her, and left no seed: last of all the woman died also.

23In the resurrection therefore, when they shall rise, whose wife shall she be of them? for the seven had her to wife.