I will narrate another miracle, supernatural and superhuman, about a medicinal brew the foresightful blessed one prepared for some brothers who were sick. For this purpose, they took ramekins of clay and set them in the ground [near the hearth] to be heated there, and he tapped four brothers to oversee the preparation in day-long shifts. Then there came a day when it slipped their minds—or rather, the Lord allowed it to slip their minds, in order that His servant stand revealed to all.
It was a day when no one paid attention. All they did with the ramekins that morning was to wash them, fill them with cold water and leave them sitting there. But when the hour drew nigh, and they were reminded of their duty, they were ashamed to look at any of their brothers, and did not dare to go to their abbot and let him know. Finally, one of them got up the courage, and went to him and said, "We had no wood, and heated no water." The blessed one, when he heard this, said, "And why were you not mindful of it this morning? Not that it matters: I know you're trying to test me. You can go back now, your water's hot." Doubtful as they were, they went back and found the ramekins bubbling, though it was obvious no fire had gone beneath them that whole day. And once again, the brothers marveled at the man's faith.
These few miracles have been chosen in order that we may believe in the many I could set forth, and that all things were possible for him through his perfect faith.
The Life of Alexander the Sleepless III.47