كتاب النكاح
8  
Marriage
Bulugh al-Maram 1117
Narrated 'Umar (RA) regarding a wife of a lost husband:
She should wait for four years and then observe the 'Iddah for four months and ten days (before she may remarry). [Malik and ash-Shafi'i reported it].
وَعَنْ عُمَرَ ‏- رضى الله عنه ‏- ‏- { فِي اِمْرَأَةِ اَلْمَفْقُودِ‏- تَرَبَّصُ أَرْبَعَ سِنِينَ, ثُمَّ تَعْتَدُّ أَرْبَعَةَ أَشْهُرٍ وَعَشْرًا } .‏ أَخْرَجَهُ مَالِكٌ, وَالشَّافِعِيُّ 1‏ .‏
Reference : Bulugh al-Maram 1117
In-book reference : Book 8, Hadith 1117
English translation : Book 8, Hadith 1128
Hadith Text
Reference