Sayyiduna Ali (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "I have been forbidden to recite (the Qur'an) in bowing or prostration. So when you bow, acknowledge the greatness of Allah Almighty, and when you prostrate, strive earnestly in supplication, for it is fitting that it be answered for you."
Abdullah recorded it in his Ziyadat; Imam Abu Ya'la recorded it as a mawquf (Companion's own statement) narration; and Imam al-Bazzar also recorded it. (Allamah al-Haythami says:) I say: In the Sahih, only this part of it is mentioned: "I have been forbidden to recite (the Qur'an) in bowing and prostration." Its chain contains Abd al-Rahman bin Ishaq bin al-Harith, who is da'if (weak) according to all of them.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2773