The tenth of Paul's Epistles, and the fifteenth book in the New Testament, is I Timothy. It was written around 64 AD to Timothy, one of Paul's closest friends, who he had converted 15 or so years earlier.
The letter was written shortly after Paul had visited Ephesus, where Timothy had been positioned as Paul's representative. Paul hoped to one day return, but this letter was written to give Timothy advice on his ministry in the meantime.
I Timothy 5:9-12
"Let not a widow be taken into the number under threescore years old, having been the wife of one man, well reported of for good works; if she have brought up children, if she have lodged strangers, if she have washed the saints’ feet, if she have relieved the afflicted, if she have diligently followed every good work. But the younger widows refuse: for when they have begun to wax wanton against Christ, they will marry; having damnation, because they have cast off their first faith"