It is narrated from Sa'id bin al-Musayyib (may Allah have mercy on him) that Umar bin al-Khattab (may Allah be pleased with him) used to send back, from al-Bayda', the women whose husbands had died; he would prevent them from Hajj.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب العدد / 15504