بُلُوغُ الْمَرَامِ
Bulugh al-Maram 1118
Marriage
وَعَنْ اَلْمُغِيرَةِ بْنِ شُعْبَةَ - رضى الله عنه - قَالَ: قَالَ رَسُولُ اَللَّهِ - صلى الله عليه وسلم -{ اِمْرَأَةُ اَلْمَفْقُودِ اِمْرَأَتُهُ حَتَّى يَأْتِيَهَا اَلْبَيَانُ. } أَخْرَجَهُ اَلدَّارَقُطْنِيُّ بِإِسْنَادٍ ضَعِيفٍ [1] .
Narrated al-Mughirah bin Shu'bah (RA): Allah's Messenger (ﷺ) said: "The spouse of a lost husband remains his wife till she gets a certain news about his death." [ad-Daraqutni reported it with a Da'if (weak) chain of narrators].
Sunnah.com reference: Book 8, Hadith 182