Sunan an-Nasa'i, Book 33, Hadith 1 (In-Book) ⓘ
Hilal bin Al-'Ala' informed us: "My father narrated to us: Ubaidullah -he is, Ibn 'Amr- narrated to us, from Sufyan, from Ibn Abi Najih, from Tawus, from Zaid bin Thabit, that the Prophet said: 'Ar-Ruqba is permissible.'"
أَخْبَرَنَا هِلاَلُ بْنُ الْعَلاَءِ، قَالَ حَدَّثَنَا أَبِي قَالَ، حَدَّثَنَا عُبَيْدُ اللَّهِ، - وَهُوَ ابْنُ عَمْرٍو - عَنْ سُفْيَانَ، عَنِ ابْنِ أَبِي نَجِيحٍ، عَنْ طَاوُسٍ، عَنْ زَيْدِ بْنِ ثَابِتٍ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " الرُّقْبَى جَائِزَةٌ " .
also referenced under: Hadith 3706 (Reference) & Volume 4, Book 33, Hadith 3736 (DarusSalam)