Bakr bin Bakkar narrated it from Abu Hurrah with the same chain, saying: "The Messenger of Allah (peace and blessings be upon him) said," and he did not express any doubt.
(b) It has been narrated from the Prophet (peace and blessings be upon him) through another chain, but its chain is open to question.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 1413