It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that he said: "When the Messenger of Allah (peace and blessings be upon him) recited 'Bismillahir-Rahmanir-Rahim' (In the name of Allah, the Most Gracious, the Most Merciful), the polytheists would mock him (peace and blessings be upon him) and say: Muhammad (peace and blessings be upon him) is mentioning the god of Yamamah; and Musaylimah used to call himself 'al-Rahman'. Then when this verse was revealed, the Messenger of Allah (peace and blessings be upon him) was commanded not to recite it aloud."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Salim al-Aftas (may Allah have mercy on him) except Sharik (may Allah have mercy on him), and Abbad bin al-Awwam (may Allah have mercy on him) is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب العين / 4756
Hadith Gradingمحدثین:رجاله موثقون، والصحيح أنه مرسل
Hadith Takhrij«قال ابن رجب الحنبلي: لو صح لدل على نسخ الجهر بها ولكن الصحيح أنه مرسل «فتح الباري شرح صحيح البخاري لابن رجب، ج 4، ص 370»» «قال الهيثمي: رجاله موثقون «مجمع الزوائد ومنبع الفوائد، ج 2، ص 108»» «أخرجه الطبراني فى «الكبير» برقم: 12245، وأبو داود فى «المراسيل» برقم: 34»