It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that a very old man came to the Prophet (peace and blessings be upon him) and said: "O Messenger of Allah, teach me a deed by which I may draw near to my Lord, the Mighty and Majestic." He (peace and blessings be upon him) said: "Hold fast to jihad in the path of Allah." He said: "I am not able to do that; I have become too old and weak for it." He (peace and blessings be upon him) said: "Then become a mu'adhdhin (caller to prayer)."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Abd al-Aziz bin Qurayr except Mubarak bin Rashid, Dawud bin Shabib is alone in narrating it, and it is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) only with this chain."
Hadith Referenceالمعجم الأوسط / باب الصاد / 3670
Hadith Gradingمحدثین:إسناده ضعيف، فيه قريب والد الأصمعي منكر الحديث
Hadith Takhrij«قال الهيثمي: فيه قريب والد الأصمعي وهو منكر الحديث «مجمع الزوائد ومنبع الفوائد، ج 1، ص 327»»