It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that "the Prophet (peace and blessings be upon him) used to raise both his hands when saying the takbir for bowing (ruku'), and when saying the takbir as he went down to prostrate."
No one narrated this hadith from Artah (may Allah have mercy on him) except Jarrah (may Allah have mercy on him).
In the printed edition of Maktabat al-Ma'arif, (Fulayh) is given.
Hadith Referenceالمعجم الأوسط / باب الألف / 16
Hadith Gradingمحدثین:إسناده صحيح
Hadith Takhrij«قال الهيثمي: إسناده صحيح «مجمع الزوائد ومنبع الفوائد، ج 2، ص 102»»