Nafi' (may Allah have mercy on him) narrates that whenever Sayyiduna Ibn Umar (may Allah be pleased with them both) intended to touch (istilam) the Black Stone, he would recite this supplication: 'Allahumma imanan bika, wa tasdiqan bi-kitabika wa sunnati nabiyyika Muhammad (peace and blessings be upon him)' (O Allah, (I do this) believing in You, affirming Your Book, and following the Sunnah of Your Prophet Muhammad (peace and blessings be upon him)). Then he would send blessings upon the Prophet (peace and blessings be upon him) and touch the Black Stone.
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Muhammad bin Muhajir except Awn bin Sallam."
Hadith Referenceالمعجم الأوسط / باب الميم / 5486
Hadith Gradingمحدثین:رجاله رجال الصحيح
Hadith Takhrij«قال الهيثمي: ورجاله رجال الصحيح «مجمع الزوائد ومنبع الفوائد، ج 3، ص 240»» «أخرجه الطبراني فى «الأوسط» برقم: 5843»