It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever writes blessings (salawat) upon me in a book, the angels will continue to seek forgiveness for him as long as my name remains in that book."
Imam al-Tabarani (may Allah have mercy on him) said: "This hadith is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) only with this chain, and Ishaq (may Allah have mercy on him) is alone in narrating it."
It is like this (al-Darisi) in the printed Dar al-Haramayn edition, whereas the correct form is Bishr bin Ubayd al-Farisi.
Hadith Referenceالمعجم الأوسط / باب الألف / 1835
Hadith Gradingمحدثین:إسناده ضعيف جدًّا، فيه بشر بن عبيد الدارسي كذبه الأزدي
Hadith Takhrij«قال الهيثمي: فيه بشر بن عبيد الدارسي كذبه الأزدي وغيره «مجمع الزوائد ومنبع الفوائد، ج 1، ص 137»»