Ibrahim ibn Adham dating history

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I visited him in his cell, and said to him, "Father Simeon, how long hast thou been here?" "For seventy years," he answered. "What is thy food?" I asked. "O Hanifite," he countered, "what hast caused thee to ask this?" "I wanted to know," I replied. Then he said. "Every night, one chickpea." I said, "What stirs thee in thy heart so that this pea suffices thee?" He answered, "They come to me one day in every year and adorn my cell and process about it, so doing me reverence; and whenever my spirit wearies of worship, I remind it of that hour, and endure the labors of a year for the sake of an hour. Do thou, O Hanifite, endure the labor of a year for the glory of eternity."