It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that he said: "A man complained to the Prophet (peace and blessings be upon him) of a poor memory, and he (peace and blessings be upon him) said: 'Seek help from your right hand.'"
Imam al-Tabarani (may Allah have mercy on him) said: "This hadith is not narrated from Ubaydullah bin Abi Bakr except with this chain, and Isma'il is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الألف / 2825
Hadith Gradingمحدثین:إسناده ضعيف لضعف إسماعيل بن سيف
Hadith Takhrij«قال الهيثمي: وفيه إسماعيل بن سيف وهو ضعيف «مجمع الزوائد ومنبع الفوائد، ج 1، ص 152»»