It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that "whenever the Messenger of Allah (peace and blessings be upon him) feared that he (peace and blessings be upon him) would forget something, he (peace and blessings be upon him) would tie a thread on his blessed hand so that he could remember that matter by its help and it would serve as a reminder for him (peace and blessings be upon him)."
Al-Harith bin Abi Usamah recorded it in his Musnad; its chain contains a narrator named Anbasah bin Abd al-Rahman, who is matruk al-hadith (abandoned in hadith) and severely da'if (weak), on account of which this report is extremely weak and unreliable in its chain.
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / كتاب العلم / 3044
Hadith Gradingمحدثین:إسناده موضوع
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :حديث موضوع. » «أخرجه المعجم الأوسط للطبراني برقم: 7156»