In one narration the words are: He climbed onto the back of the Prophet (peace and blessings be upon him), and he did this more than once.
Ahmad, al-Bazzar and Tabarani recorded it. The narrators of Ahmad are the narrators of the Sahih, except for Mubarak bin Fadalah, and he is thiqah (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب المناقب / 15032
Hadith Gradingمحدثین:إسنادہ حسن۔
Hadith Takhrij«اخرجه الطبراني فى المعجم الكبير (2594) أخرجه الطبراني فى المعجم الصغير (51/5)»