Sunan Abi Dawud 1557
سنن أبي داود#1557Sahihحَدَّثَنَا ابْنُ السَّرْحِ، وَسُلَيْمَانُ بْنُ دَاوُدَ، قَالاَ أَخْبَرَنَا ابْنُ وَهْبٍ، أَخْبَرَنِي يُونُسُ، عَنِ الزُّهْرِيِّ، قَالَ قَالَ أَبُو بَكْرٍ إِنَّ حَقَّهُ أَدَاءُ الزَّكَاةِ وَقَالَ عِقَالاً .
This tradition has also been transmitted by Al Zuhri through a different chain of narrators. This version has “Abu Bakr said its due is the payment of zakat.” He used the word “a rope of a Camel”
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Al-AlbaniShadh
Muhammad Muhyi Al-Din Abdul HamidShadh
Shuaib Al ArnautSahih
Zubair Ali ZaiSahih Bukhari (7284، 7285) Sahih Muslim (20)
In-book reference: 9:2