The wife is bound by the law as long as her husband lives; but if her husband is dead, she is at liberty to be married to whom she will; only in the Lord.
All Commentaries on 1 Corinthians 7:39 Go To 1 Corinthians 7
Shepherd of Hermas
AD 150
And I said, "If a wife or husband die, and the widower or widow marry, does he or she commit sin? ""There is no sin in marrying again "said he; "but if they remain unmarried, they gain greater honour and glory with the Lord; but if they marry, they do not sin.