the Book of Asceticism (Kitab al-Zuhd), as well as the Book of Supplication (Kitab al-Duʿaʾ), the Book of Wisdom (Kitab al-Hikmah), the Book on the Rituals of Pilgrimage (Kitab al-Manasik), and the Book on Earning a Livelihood (Kitab al-Takassub).
People were eager to attend the public readings of his writings. When his mother died in 220 AH, he performed Hajj and then resumed the frontier campaigns.
He set out for the lands of the Turks and secured a remarkable conquest for which he was envied. His enemies denounced him to Ibn Ṭāhir, who summoned him, refused to let him sit, and said, “You march out, gather this following around yourself, and oppose the aides of the ruler?”
When Ibn Ṭāhir perceived his sincerity, he released him. Ahmad continued on and settled as a neighbor of Mecca.
The Karramiyyah (1) laid claim to him and held him in great esteem because he had been the teacher of Muhammad ibn Karram; nevertheless, his creed was sound—praise be to Allah.
Yahya ibn Yahya al-Tamimi said, “If Ahmad ibn Harb is not one of the abdal, I do not know who they are!”
Muhammad ibn ʿAli al-Marwazi remarked, “He narrates reports that have no basis.”
Nasr ibn Mahmud al-Balkhi relates that Ahmad ibn Harb said: “I worshipped Allah for fifty years, yet I did not taste the sweetness of worship until I abandoned three things: I gave up seeking people’s approval so that I could speak the truth; I gave up the company of the wicked until I found the company of the righteous; and I gave up the sweetness of this world until I found the sweetness of the Hereafter.”
It is also said that he prayed for rain for the people of Bukhara, and they did not disperse until they were wading through rainwater. May Allah’s mercy be upon him.