Sunan an-Nasa'i, Hadith 3714 ⓘ
Hanzalah narrated that he heard Tawus say: "The Messenger of Allah said: 'Ruqba is not permissible. Whoever is given something on the basis of Ruqba, it is part of his estate.'"
أَخْبَرَنَا مُحَمَّدُ بْنُ حَاتِمٍ، قَالَ أَنْبَأَنَا حِبَّانُ، قَالَ حَدَّثَنَا عَبْدُ اللَّهِ، عَنْ حَنْظَلَةَ، أَنَّهُ سَمِعَ طَاوُسًا، يَقُولُ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " لاَ تَحِلُّ الرُّقْبَى فَمَنْ أُرْقِبَ رُقْبَى فَهُوَ سَبِيلُ الْمِيرَاثِ " .
also referenced under: Book 33, Hadith 9 (In-Book) & Volume 4, Book 33, Hadith 3744 (DarusSalam)