Sayyiduna Rafi' bin Khadij (may Allah be pleased with him) said: The Prophet (peace and blessings be upon him) used to tie a thread on his ring so as to remember something by it.
Al-Tabarani recorded it in al-Mu'jam al-Kabir; its chain mentions: Baqiyyah narrated it from Abu Abd al-Rahman. Imam Bukhari (may Allah have mercy on him) said: Ghiyath bin Ibrahim, who is a da'if (weak) narrator, has the kunyah Abu Abd al-Rahman, and Baqiyyah narrated from him.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب العلم / 758
Hadith Gradingمحدثین:إسنادہ ضعیف
Hadith Takhrij«اخرجه الامام الطبراني فى معجمه الكبير 4431 ، أخرجه المعجم الكبير للطبراني برقم: 4431»