The Book of 'Umra
34/1. Chapter:
"'Umra (A Gift Given For Life) Belongs To The Heir"
Sunan an-Nasai
أَخْبَرَنَا مُحَمَّدُ بْنُ عَبْدِ الأَعْلَى، قَالَ حَدَّثَنَا خَالِدٌ، قَالَ حَدَّثَنَا شُعْبَةُ، عَنْ عَمْرِو بْنِ دِينَارٍ، قَالَ سَمِعْتُ طَاوُسًا، يُحَدِّثُ عَنْ زَيْدِ بْنِ ثَابِتٍ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " الْعُمْرَى هِيَ لِلْوَارِثِ " .
It was narrated from Zaid bin Thabit that the Prophet said: "'Umra (a gift given for life) belongs to the heir."
Reference : Sunan an-Nasa'i 3720In-book reference : Book 34, Hadith 1English translation : Vol. 4, Book 34, Hadith 3750