Takhrij Hadith 2115: "I prayed behind an old…"

I prayed behind an old man in Mecca, and he said the takbīr twenty-two times. So I said to Ibn ʿAbbas: “He is a fool!” He said: “May your mother be bereaved of you! It is the Sunna of Abu al-Qasim (peace and blessings be upon him).”