Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) narrates: The Noble Prophet (peace and blessings be upon him) said: "When Jibreel came to me with revelation, the very first thing he recited before me was 'Bismillah ir-Rahman ir-Raheem.'"
Hadith Referenceسنن الدارقطني / كتاب الصلاة / 1167
Hadith Takhrij«أخرجه الدارقطني فى ((سننه)) برقم: 1167، والطبراني فى ((الأوسط)) برقم: 3480»