In one narration the words are: I showed them my stomach, and all of them became Muslims.
Imam al-Tabarani recorded it with two chains. The first chain is hasan (good); its chain contains Abu Ghalib, who has, however, been declared trustworthy.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب المناقب / 16057
Hadith Gradingمحدثین:إسنادہ حسن
Hadith Takhrij«اخرجه الطبراني فى المعجم الكبير (8073)»