A woman is bound to her husband during his lifetime; but if he dies, she is free to marry anyone she pleases — only, it must be a Christian.
For married people these are my instructions (and they are the Lord's, not mine). A wife is not to separate from her husband —
(Should the unbelieving partner be determined to separate, however, separation let it be; in such cases the Christian brother or sister is not tied to marriage.) It is to a life of peace that God has called us.
Thus both are right alike in marrying and in refraining from marriage, but he who does not marry will be found to have done better.