It is narrated from Sayyiduna Sa'd (may Allah be pleased with him) that he said: "I saw the Messenger of Allah (peace and blessings be upon him) when he (peace and blessings be upon him) bowed (in ruku'): he would place his palms on his knees and keep space between his fingers (keep them spread apart)."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Abd al-Malik bin Umayr (may Allah have mercy on him) except Ikrimah bin Ibrahim al-Azdi (may Allah have mercy on him)."
Hadith Referenceالمعجم الأوسط / باب الألف / 2050
Hadith Gradingمحدثین:غريب، تفرد به عكرمة بن إبراهيم
Hadith Takhrij«قال الطبراني: لم يروه عن عبد الله بن عمير يعني عن مصعب إلا عكرمة بن إبراهيم «الإعلام بسنته عليه الصلاة والسلام بشرح سنن ابن ماجه الإمام، ج 5، ص 304»»